非平衡态热力学

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Non-equilibrium thermodynamics is a branch of thermodynamics that deals with physical systems that are not in thermodynamic equilibrium but can be described in terms of variables (non-equilibrium state variables) that represent an extrapolation of the variables used to specify the system in thermodynamic equilibrium. Non-equilibrium thermodynamics is concerned with transport processes and with the rates of chemical reactions. It relies on what may be thought of as more or less nearness to thermodynamic equilibrium.

Non-equilibrium thermodynamics is a branch of thermodynamics that deals with physical systems that are not in thermodynamic equilibrium but can be described in terms of variables (non-equilibrium state variables) that represent an extrapolation of the variables used to specify the system in thermodynamic equilibrium. Non-equilibrium thermodynamics is concerned with transport processes and with the rates of chemical reactions. It relies on what may be thought of as more or less nearness to thermodynamic equilibrium.

非平衡态热力学Non-equilibrium thermodynamics是热力学的一个分支，研究某些不处于热力学平衡中的物理系统。但是这些系统可以用一些变量(非平衡态变量)来描述，这些变量来源于用来描述热力学平衡系统的变量的外推。非平衡态热力学与输运过程和化学反应速率相关。它依赖于被认为是或多或少接近热力学平衡的东西。

Almost all systems found in nature are not in thermodynamic equilibrium, for they are changing or can be triggered to change over time, and are continuously and discontinuously subject to flux of matter and energy to and from other systems and to chemical reactions. Some systems and processes are, however, in a useful sense, near enough to thermodynamic equilibrium to allow description with useful accuracy by currently known non-equilibrium thermodynamics. Nevertheless, many natural systems and processes will always remain far beyond the scope of non-equilibrium thermodynamic methods due to the existence of non variational dynamics, where the concept of free energy is lost.^[1]

Almost all systems found in nature are not in thermodynamic equilibrium, for they are changing or can be triggered to change over time, and are continuously and discontinuously subject to flux of matter and energy to and from other systems and to chemical reactions. Some systems and processes are, however, in a useful sense, near enough to thermodynamic equilibrium to allow description with useful accuracy by currently known non-equilibrium thermodynamics. Nevertheless, many natural systems and processes will always remain far beyond the scope of non-equilibrium thermodynamic methods due to the existence of non variational dynamics, where the concept of free energy is lost.

几乎所有在自然界中发现的系统都不是在热力学平衡中，因为它们正在随着时间变化或者可以被触发而发生变化，并且不断地和其他系统交换物质和能量以及参与化学反应。然而，某些系统和过程在某种可采用的意义上足够接近于热力学平衡，允许目前已知的非平衡态热力学对其进行有用的精确描述。然而，许多自然系统和过程由于非变分动力学的存在，使得自由能的概念不存在，因此总是远远超出非平衡热力学方法的范围。

The thermodynamic study of non-equilibrium systems requires more general concepts than are dealt with by equilibrium thermodynamics. One fundamental difference between equilibrium thermodynamics and non-equilibrium thermodynamics lies in the behaviour of inhomogeneous systems, which require for their study knowledge of rates of reaction which are not considered in equilibrium thermodynamics of homogeneous systems. This is discussed below. Another fundamental and very important difference is the difficulty or impossibility, in general, in defining entropy at an instant of time in macroscopic terms for systems not in thermodynamic equilibrium; it can be done, to useful approximation, only in carefully chosen special cases, namely those that are throughout in local thermodynamic equilibrium.^[2]^[3]

The thermodynamic study of non-equilibrium systems requires more general concepts than are dealt with by equilibrium thermodynamics. One fundamental difference between equilibrium thermodynamics and non-equilibrium thermodynamics lies in the behaviour of inhomogeneous systems, which require for their study knowledge of rates of reaction which are not considered in equilibrium thermodynamics of homogeneous systems. This is discussed below. Another fundamental and very important difference is the difficulty or impossibility, in general, in defining entropy at an instant of time in macroscopic terms for systems not in thermodynamic equilibrium; it can be done, to useful approximation, only in carefully chosen special cases, namely those that are throughout in local thermodynamic equilibrium.

非平衡体系的热力学研究比平衡态热力学研究需要更普适的概念。非平衡态热力学和平衡态热力学之间的一个根本区别在于非均匀系统的行为，这就要求他们研究反应速率的知识，而这一点在均匀系统的平衡态热力学中没有考虑，下面将讨论这一点。另一个基本的和非常重要的区别是，在一般情况下，难以或不可能用宏观量来定义非热力学平衡系统在瞬时的熵; 只有在某些精心选择的特殊情况下加入一些有用的近似才能定义熵，即局部热力学平衡。

Scope

范围

Difference between equilibrium and non-equilibrium thermodynamics

平衡态热力学和非平衡态热力学的区别

A profound difference separates equilibrium from non-equilibrium thermodynamics. Equilibrium thermodynamics ignores the time-courses of physical processes. In contrast, non-equilibrium thermodynamics attempts to describe their time-courses in continuous detail.

平衡态热力学和非平衡态热力学之间存在一个深刻的区别。平衡态热力学忽略了物理过程的时间进程。反之，非平衡态热力学试图不断详细地描述物理过程的时间进程。

Equilibrium thermodynamics restricts its considerations to processes that have initial and final states of thermodynamic equilibrium; the time-courses of processes are deliberately ignored. Consequently, equilibrium thermodynamics allows processes that pass through states far from thermodynamic equilibrium, that cannot be described even by the variables admitted for non-equilibrium thermodynamics,^[4] such as time rates of change of temperature and pressure.^[5] For example, in equilibrium thermodynamics, a process is allowed to include even a violent explosion that cannot be described by non-equilibrium thermodynamics.^[4] Equilibrium thermodynamics does, however, for theoretical development, use the idealized concept of the "quasi-static process". A quasi-static process is a conceptual (timeless and physically impossible) smooth mathematical passage along a continuous path of states of thermodynamic equilibrium.^[6] It is an exercise in differential geometry rather than a process that could occur in actuality.

Equilibrium thermodynamics restricts its considerations to processes that have initial and final states of thermodynamic equilibrium; the time-courses of processes are deliberately ignored. Consequently, equilibrium thermodynamics allows processes that pass through states far from thermodynamic equilibrium, that cannot be described even by the variables admitted for non-equilibrium thermodynamics, such as time rates of change of temperature and pressure. For example, in equilibrium thermodynamics, a process is allowed to include even a violent explosion that cannot be described by non-equilibrium thermodynamics. Equilibrium thermodynamics does, however, for theoretical development, use the idealized concept of the "quasi-static process". A quasi-static process is a conceptual (timeless and physically impossible) smooth mathematical passage along a continuous path of states of thermodynamic equilibrium. It is an exercise in differential geometry rather than a process that could occur in actuality.

平衡态热力学把它的研究范围局限于具有热力学平衡的初态和末态的过程，过程的时间进程被有意地忽略。因此，平衡态热力学允许物理过程经历过远离热力学平衡的状态，这些状态甚至不能用非平衡态热力学所允许的变量来描述，比如温度和压强的时间变化率。例如在平衡态热力学中，一个过程甚至可以包括一个非平衡态热力学无法描述的剧烈爆炸。然而，为了理论发展，平衡态热力学使用了“准静态过程”的理想化概念。准静态过程是一种概念上(永恒的、物理上不可能的)沿着热力学平衡状态连续路径的平滑数学过程。它是微分几何的练习，而不是现实中可能发生的过程。

Non-equilibrium thermodynamics, on the other hand, attempting to describe continuous time-courses, needs its state variables to have a very close connection with those of equilibrium thermodynamics.^[7] This profoundly restricts the scope of non-equilibrium thermodynamics, and places heavy demands on its conceptual framework.

Non-equilibrium thermodynamics, on the other hand, attempting to describe continuous time-courses, needs its state variables to have a very close connection with those of equilibrium thermodynamics. This profoundly restricts the scope of non-equilibrium thermodynamics, and places heavy demands on its conceptual framework.

另一方面，非平衡态热力学试图描述连续的时间进程，这需要它的状态变量与平衡态热力学的状态变量之间有非常密切的联系。这极大地限制了非平衡态热力学的范围，并对其概念框架提出了严格的要求。

Non-equilibrium state variables

非平衡态变量

The suitable relationship that defines non-equilibrium thermodynamic state variables is as follows. On occasions when the system happens to be in states that are sufficiently close to thermodynamic equilibrium, non-equilibrium state variables are such that they can be measured locally with sufficient accuracy by the same techniques as are used to measure thermodynamic state variables, or by corresponding time and space derivatives, including fluxes of matter and energy. In general, non-equilibrium thermodynamic systems are spatially and temporally non-uniform, but their non-uniformity still has a sufficient degree of smoothness to support the existence of suitable time and space derivatives of non-equilibrium state variables. Because of the spatial non-uniformity, non-equilibrium state variables that correspond to extensive thermodynamic state variables have to be defined as spatial densities of the corresponding extensive equilibrium state variables. On occasions when the system is sufficiently close to thermodynamic equilibrium, intensive non-equilibrium state variables, for example temperature and pressure, correspond closely with equilibrium state variables. It is necessary that measuring probes be small enough, and rapidly enough responding, to capture relevant non-uniformity. Further, the non-equilibrium state variables are required to be mathematically functionally related to one another in ways that suitably resemble corresponding relations between equilibrium thermodynamic state variables.^[8] In reality, these requirements are very demanding, and it may be difficult or practically, or even theoretically, impossible to satisfy them. This is part of why non-equilibrium thermodynamics is a work in progress.

The suitable relationship that defines non-equilibrium thermodynamic state variables is as follows. On occasions when the system happens to be in states that are sufficiently close to thermodynamic equilibrium, non-equilibrium state variables are such that they can be measured locally with sufficient accuracy by the same techniques as are used to measure thermodynamic state variables, or by corresponding time and space derivatives, including fluxes of matter and energy. In general, non-equilibrium thermodynamic systems are spatially and temporally non-uniform, but their non-uniformity still has a sufficient degree of smoothness to support the existence of suitable time and space derivatives of non-equilibrium state variables. Because of the spatial non-uniformity, non-equilibrium state variables that correspond to extensive thermodynamic state variables have to be defined as spatial densities of the corresponding extensive equilibrium state variables. On occasions when the system is sufficiently close to thermodynamic equilibrium, intensive non-equilibrium state variables, for example temperature and pressure, correspond closely with equilibrium state variables. It is necessary that measuring probes be small enough, and rapidly enough responding, to capture relevant non-uniformity. Further, the non-equilibrium state variables are required to be mathematically functionally related to one another in ways that suitably resemble corresponding relations between equilibrium thermodynamic state variables. In reality, these requirements are very demanding, and it may be difficult or practically, or even theoretically, impossible to satisfy them. This is part of why non-equilibrium thermodynamics is a work in progress.

定义非平衡热力学状态变量的合适关系如下所述。当系统处于足够接近热力学平衡态的状态时，非平衡态变量可以通过与测量热力学状态变量相同的技术，足够精确地在局部测量,或者通过相应的时间和空间导数得到，包括物质和能量的流。一般来说，非平衡态热力学系统在空间和时间上都是不均匀的，但是它们的不均匀性仍然具有足够的光滑度，使得非平衡态变量存在合适的时间和空间导数。由于空间的非均匀性，非平衡态对应的热力学广延量必须定义为平衡态中相应广延量的空间密度。在系统足够接近热力学平衡的情况下，非平衡态的强度量，例如温度和压强，与平衡状态变量密切对应。为了刻画相应的非均匀性，测量探头必须足够小，响应速度也必须足够快。此外，非平衡状态变量之间需要在数学上和功能上相互关联，以适当的类似于平衡热力学状态变量之间对应关系的方式。在现实中这些要求是非常苛刻的，并且可能很难，或者说在实际上，甚至在理论上都不可能满足。这就一部分解释了为什么非平衡态热力学是一个仍在进展中的工作。

Overview

概述

Non-equilibrium thermodynamics is a work in progress, not an established edifice. This article is an attempt to sketch some approaches to it and some concepts important for it.

非平衡态热力学是一项正在进行的工作，而不是一座已经建立的大厦。本文试图勾勒出一些方法和一些重要的概念。

Some concepts of particular importance for non-equilibrium thermodynamics include time rate of dissipation of energy (Rayleigh 1873,^[9] Onsager 1931,^[10] also^[8]^[11]), time rate of entropy production (Onsager 1931),^[10] thermodynamic fields,^[12]^[13]^[14] dissipative structure,^[15] and non-linear dynamical structure.^[11]

Some concepts of particular importance for non-equilibrium thermodynamics include time rate of dissipation of energy (Rayleigh 1873, Onsager 1931, also), time rate of entropy production (Onsager 1931),thermodynamic fields, dissipative structure,and non-linear dynamical structure.

非平衡态热力学中一些特别重要的概念包括能量耗散的时间速率(Rayleigh 1873，Onsager 1931)、熵产生速率(Onsager 1931)、热力学场、耗散结构和非线性动力结构。

One problem of interest is the thermodynamic study of non-equilibrium steady states, in which entropy production and some flows are non-zero, but there is no time variation of physical variables.

一个有趣的问题是非平衡定态的热力学研究，其中熵产生和一些流是非零的，但没有物理量随时间变化。

One initial approach to non-equilibrium thermodynamics is sometimes called 'classical irreversible thermodynamics'.^[3] There are other approaches to non-equilibrium thermodynamics, for example extended irreversible thermodynamics,^[3]^[16] and generalized thermodynamics,^[17] but they are hardly touched on in the present article.

One initial approach to non-equilibrium thermodynamics is sometimes called 'classical irreversible thermodynamics'. There are other approaches to non-equilibrium thermodynamics, for example extended irreversible thermodynamics, and generalized thermodynamics, but they are hardly touched on in the present article.

非平衡态热力学的一个初始方法有时被称为经典不可逆热力学。研究非平衡热力学还有其他方法，如扩展不可逆热力学和广义热力学，但在本文中很少涉及。

Quasi-radiationless non-equilibrium thermodynamics of matter in laboratory conditions

实验室条件下物质的准无辐射非平衡热力学

According to Wildt^[18] (see also Essex^[19]^[20]^[21]), current versions of non-equilibrium thermodynamics ignore radiant heat; they can do so because they refer to laboratory quantities of matter under laboratory conditions with temperatures well below those of stars. At laboratory temperatures, in laboratory quantities of matter, thermal radiation is weak and can be practically nearly ignored. But, for example, atmospheric physics is concerned with large amounts of matter, occupying cubic kilometers, that, taken as a whole, are not within the range of laboratory quantities; then thermal radiation cannot be ignored.

According to Wildt (see also Essex), current versions of non-equilibrium thermodynamics ignore radiant heat; they can do so because they refer to laboratory quantities of matter under laboratory conditions with temperatures well below those of stars. At laboratory temperatures, in laboratory quantities of matter, thermal radiation is weak and can be practically nearly ignored. But, for example, atmospheric physics is concerned with large amounts of matter, occupying cubic kilometers, that, taken as a whole, are not within the range of laboratory quantities; then thermal radiation cannot be ignored.

根据 Wildt （同时参考 Essex）的说法，当前版本的非平衡态热力学忽略了辐射热; 他们之所以可以这样做，是因为他们参照的是实验室条件下的物质数量，而实验室条件下的物质温度远低于恒星的温度。在实验室温度下，在实验室数量的物质中，热辐射很弱几乎可以忽略不计。但是，例如大气物理学关注的是占据立方公里的大量物质，它们作为一个整体，不在实验室数量的范围内，那么热辐射就不能被忽视。

Local equilibrium thermodynamics

局部平衡热力学

The terms 'classical irreversible thermodynamics'^[3] and 'local equilibrium thermodynamics' are sometimes used to refer to a version of non-equilibrium thermodynamics that demands certain simplifying assumptions, as follows. The assumptions have the effect of making each very small volume element of the system effectively homogeneous, or well-mixed, or without an effective spatial structure, and without kinetic energy of bulk flow or of diffusive flux. Even within the thought-frame of classical irreversible thermodynamics, care^[11] is needed in choosing the independent variables^[22] for systems. In some writings, it is assumed that the intensive variables of equilibrium thermodynamics are sufficient as the independent variables for the task (such variables are considered to have no 'memory', and do not show hysteresis); in particular, local flow intensive variables are not admitted as independent variables; local flows are considered as dependent on quasi-static local intensive variables.

The terms 'classical irreversible thermodynamics' and 'local equilibrium thermodynamics' are sometimes used to refer to a version of non-equilibrium thermodynamics that demands certain simplifying assumptions, as follows. The assumptions have the effect of making each very small volume element of the system effectively homogeneous, or well-mixed, or without an effective spatial structure, and without kinetic energy of bulk flow or of diffusive flux. Even within the thought-frame of classical irreversible thermodynamics, care is needed in choosing the independent variables for systems. In some writings, it is assumed that the intensive variables of equilibrium thermodynamics are sufficient as the independent variables for the task (such variables are considered to have no 'memory', and do not show hysteresis); in particular, local flow intensive variables are not admitted as independent variables; local flows are considered as dependent on quasi-static local intensive variables.

术语“经典不可逆热力学”和“局部平衡热力学”有时被用来指非平衡热力学中的一类，它需要如下一些简化的假设。这些假设的效果是使系统的每个非常小的体积元是等效同质的，或者是充分混合的，或者没有有效的空间结构，以及没有体流动能或扩散通量。即使在经典不可逆热力学的思想框架内，在选择系统的独立变量时也需要谨慎。在某些著作中，假设平衡热力学的强度量足够作为任务的独立变量(这些变量被认为没有“记忆”，不显示迟滞现象);特别地，局部流的强度量不允许作为独立变量;局部流被认为依赖于准静态局部强度量。

Also it is assumed that the local entropy density is the same function of the other local intensive variables as in equilibrium; this is called the local thermodynamic equilibrium assumption^[8]^[11]^[15]^[16]^[23]^[24]^[25]^[26] (see also Keizer (1987)^[27]). Radiation is ignored because it is transfer of energy between regions, which can be remote from one another. In the classical irreversible thermodynamic approach, there is allowed very small spatial variation, from very small volume element to adjacent very small volume element, but it is assumed that the global entropy of the system can be found by simple spatial integration of the local entropy density; this means that spatial structure cannot contribute as it properly should to the global entropy assessment for the system. This approach assumes spatial and temporal continuity and even differentiability of locally defined intensive variables such as temperature and internal energy density. All of these are very stringent demands. Consequently, this approach can deal with only a very limited range of phenomena. This approach is nevertheless valuable because it can deal well with some macroscopically observable phenomena.模板:Examples

Also it is assumed that the local entropy density is the same function of the other local intensive variables as in equilibrium; this is called the local thermodynamic equilibrium assumption (see also Keizer (1987)). Radiation is ignored because it is transfer of energy between regions, which can be remote from one another. In the classical irreversible thermodynamic approach, there is allowed very small spatial variation, from very small volume element to adjacent very small volume element, but it is assumed that the global entropy of the system can be found by simple spatial integration of the local entropy density; this means that spatial structure cannot contribute as it properly should to the global entropy assessment for the system. This approach assumes spatial and temporal continuity and even differentiability of locally defined intensive variables such as temperature and internal energy density. All of these are very stringent demands. Consequently, this approach can deal with only a very limited range of phenomena. This approach is nevertheless valuable because it can deal well with some macroscopically observable phenomena.

同时假设局部熵密度与其他局部强度量的函数关系和平衡态相同，这被称为局部热力学平衡假设(参见 Keizer (1987))。辐射可以被忽略，因为它是能量在区域之间的转移，而区域之间可以相互远离。在经典的不可逆热力学方法中，允许从微小体积元到相邻的微小的体积元有非常小的空间变化，但是假定系统的总熵可以通过简单的局部熵密度的空间积分得到，这意味着空间结构不能对系统的总熵作出贡献。这种方法假设空间和时间的连续性，甚至假设局部定义的强度量是可微的，如温度和内部能量密度。所有这些假设都是非常严格的要求。因此，这种方法只能处理非常有限范围的现象。然而这种方法是有价值的，因为它可以很好地处理一些宏观上可观察到的现象。

In other writings, local flow variables are considered; these might be considered as classical by analogy with the time-invariant long-term time-averages of flows produced by endlessly repeated cyclic processes; examples with flows are in the thermoelectric phenomena known as the Seebeck and the Peltier effects, considered by Kelvin in the nineteenth century and by Lars Onsager in the twentieth.^[23]^[28] These effects occur at metal junctions, which were originally effectively treated as two-dimensional surfaces, with no spatial volume, and no spatial variation.

In other writings, local flow variables are considered; these might be considered as classical by analogy with the time-invariant long-term time-averages of flows produced by endlessly repeated cyclic processes; examples with flows are in the thermoelectric phenomena known as the Seebeck and the Peltier effects, considered by Kelvin in the nineteenth century and by Lars Onsager in the twentieth. These effects occur at metal junctions, which were originally effectively treated as two-dimensional surfaces, with no spatial volume, and no spatial variation.

在其他著作中，考虑了局部流变量; 这些可以被认为是经典的，类比于由无休止的重复循环过程产生的流动的时间不变的长期时间平均值; 有关流动的例子是被称为 Seebeck 和 Peltier 效应的热电现象，开尔文在十九世纪以及拉斯昂萨格尔在二十世纪考虑了这一现象。这些效应发生在金属连接处，最初被有效地处理为二维表面，没有空间体积，也没有空间变化。

Local equilibrium thermodynamics with materials with "memory"

“记忆”材料的局部平衡热力学

A further extension of local equilibrium thermodynamics is to allow that materials may have "memory", so that their constitutive equations depend not only on present values but also on past values of local equilibrium variables. Thus time comes into the picture more deeply than for time-dependent local equilibrium thermodynamics with memoryless materials, but fluxes are not independent variables of state.^[29]

A further extension of local equilibrium thermodynamics is to allow that materials may have "memory", so that their constitutive equations depend not only on present values but also on past values of local equilibrium variables. Thus time comes into the picture more deeply than for time-dependent local equilibrium thermodynamics with memoryless materials, but fluxes are not independent variables of state.

局域平衡热力学的进一步扩展是允许材料具有”记忆” ，因此它们的本构方程不仅依赖于当前值，而且依赖于局域平衡变量的过去值。因此相比于无记忆材料依赖时间的局域平衡热力学，在有记忆材料研究中时间在物理图像中更为深入，但是通量并不是状态的独立变量。

Extended irreversible thermodynamics

扩展的不可逆热力学

Extended irreversible thermodynamics is a branch of non-equilibrium thermodynamics that goes outside the restriction to the local equilibrium hypothesis. The space of state variables is enlarged by including the fluxes of mass, momentum and energy and eventually higher order fluxes.

Extended irreversible thermodynamics is a branch of non-equilibrium thermodynamics that goes outside the restriction to the local equilibrium hypothesis. The space of state variables is enlarged by including the fluxes of mass, momentum and energy and eventually higher order fluxes.

扩展的不可逆热力学Extended irreversible thermodynamics是非平衡态热力学的一个分支，它超越了局部平衡假设的限制。状态变量空间通过包含质量、动量和能量的流以及最终的高阶流而被扩大。

The formalism is well-suited for describing high-frequency processes and small-length scales materials.

它的形式非常适合于描述高频过程和小尺度材料。

Basic concepts

基本概念

There are many examples of stationary non-equilibrium systems, some very simple, like a system confined between two thermostats at different temperatures or the ordinary Couette flow, a fluid enclosed between two flat walls moving in opposite directions and defining non-equilibrium conditions at the walls. Laser action is also a non-equilibrium process, but it depends on departure from local thermodynamic equilibrium and is thus beyond the scope of classical irreversible thermodynamics; here a strong temperature difference is maintained between two molecular degrees of freedom (with molecular laser, vibrational and rotational molecular motion), the requirement for two component 'temperatures' in the one small region of space, precluding local thermodynamic equilibrium, which demands that only one temperature be needed. Damping of acoustic perturbations or shock waves are non-stationary non-equilibrium processes. Driven complex fluids, turbulent systems and glasses are other examples of non-equilibrium systems.

有许多静态非平衡系统的例子，其中一些非常简单，例如被限制在两个不同温度恒温器之间的系统，或者常见的库埃特流动，两个沿相反方向运动的平板壁之间的流体，并定义了壁上的非平衡条件。激光作用也是一个非平衡过程，但它依赖于脱离局部热力学平衡，因此超出了经典不可逆热力学的范围; 这种情况下，两个分子自由度(分子激光，振动和转动分子运动)之间保持了很大的温差，这要求在一个很小的空间区域存在两个部分的“温度”，所以排除了局部热力学平衡，因为热力学平衡只需要一个温度。声扰动或激波的阻尼是非静态非平衡过程。被驱动的复杂流体、湍流系统和玻璃是非平衡系统的其他例子。

The mechanics of macroscopic systems depends on a number of extensive quantities. It should be stressed that all systems are permanently interacting with their surroundings, thereby causing unavoidable fluctuations of extensive quantities. Equilibrium conditions of thermodynamic systems are related to the maximum property of the entropy. If the only extensive quantity that is allowed to fluctuate is the internal energy, all the other ones being kept strictly constant, the temperature of the system is measurable and meaningful. The system's properties are then most conveniently described using the thermodynamic potential Helmholtz free energy (A = U - TS), a Legendre transformation of the energy. If, next to fluctuations of the energy, the macroscopic dimensions (volume) of the system are left fluctuating, we use the Gibbs free energy (G = U + PV - TS), where the system's properties are determined both by the temperature and by the pressure.

宏观系统的力学依赖于大量的广延量。应当强调的是，所有系统都与其周围环境永久地相互作用，从而造成广延量不可避免的波动。热力学系统的平衡条件与熵最大的性质有关。如果唯一允许波动的广延量是内能，而其它量都严格保持恒定，那么系统的温度就是可测量和有意义的。系统的性质可以用热力学势能亥姆霍兹自由能(A = U - TS)来描述，它是能量的勒让德变换。如果除了能量的波动，系统的宏观尺寸(体积)也可以波动，我们使用吉布斯自由能(G = U + PV - TS)，其中系统的性质既由温度决定，也由压强决定。

Non-equilibrium systems are much more complex and they may undergo fluctuations of more extensive quantities. The boundary conditions impose on them particular intensive variables, like temperature gradients or distorted collective motions (shear motions, vortices, etc.), often called thermodynamic forces. If free energies are very useful in equilibrium thermodynamics, it must be stressed that there is no general law defining stationary non-equilibrium properties of the energy as is the second law of thermodynamics for the entropy in equilibrium thermodynamics. That is why in such cases a more generalized Legendre transformation should be considered. This is the extended Massieu potential.

非平衡系统要复杂得多，它们可能存在更多广延量的波动。边界条件施加给它们某些强度量，如温度梯度或形变集体运动(剪切运动、涡旋等)，通常称为热力学力。如果自由能在平衡态热力学中非常有用，那么必须强调的是，没有像平衡态热力学中熵的热力学第二定律定律那样定义能量的静态非平衡性质的一般定律。这就是为什么在这种情况下，应该考虑一个更一般的勒让德变换。这就是拓展的马休势。

By definition, the entropy (S) is a function of the collection of extensive quantities [math]\displaystyle{ E_i }[/math]. Each extensive quantity has a conjugate intensive variable [math]\displaystyle{ I_i }[/math] (a restricted definition of intensive variable is used here by comparison to the definition given in this link) so that:

根据定义，熵(S)是广延量[math]\displaystyle{ E_i }[/math]的函数。每个广延量都有一个与之共轭的强度量密集变量[math]\displaystyle{ I_i }[/math](通过与本链接中给出的定义进行比较，这里使用了强度量的狭义定义) ，因此:

[math]\displaystyle{ I_i = \frac{\partial{S}}{\partial{E_i}}. }[/math]

We then define the extended Massieu function as follows:

然后我们将扩展的马休函数定义如下:

[math]\displaystyle{ \ k_{\rm B} M = S - \sum_i( I_i E_i), }[/math]

where [math]\displaystyle{ \ k_{\rm B} }[/math] is Boltzmann's constant, whence

其中 [math]\displaystyle{ \ k_{\rm B} }[/math] 是波尔兹曼常数，由此

[math]\displaystyle{ \ k_{\rm B} \, dM = \sum_i (E_i \, dI_i). }[/math]

The independent variables are the intensities.

这个独立变量是强度量。

Intensities are global values, valid for the system as a whole. When boundaries impose to the system different local conditions, (e.g. temperature differences), there are intensive variables representing the average value and others representing gradients or higher moments. The latter are the thermodynamic forces driving fluxes of extensive properties through the system.

强度量具有全局的值，对整个系统都有效。当边界对系统施加不同的局部条件时（例如温度差），有的强度量代表平均值，其他强度量代表梯度或更高阶矩。后者是驱动系统广延性质流动的热力学力。

It may be shown that the Legendre transformation changes the maximum condition of the entropy (valid at equilibrium) in a minimum condition of the extended Massieu function for stationary states, no matter whether at equilibrium or not.

可以说明，无论是否处于平衡状态，勒让德变换改变了静态的扩展马休函数的最小条件下熵的最大条件(平衡时有效)。

Stationary states, fluctuations, and stability

定态、涨落和稳定性

In thermodynamics one is often interested in a stationary state of a process, allowing that the stationary state include the occurrence of unpredictable and experimentally unreproducible fluctuations in the state of the system. The fluctuations are due to the system's internal sub-processes and to exchange of matter or energy with the system's surroundings that create the constraints that define the process.

在热力学中，人们经常对一个过程的定态感兴趣，允许系统状态的定态包括不可预测和实验上不可重复的涨落的发生。涨落是由于系统的内部子过程以及与系统周围环境交换物质或能量所造成的，周围环境给这一过程增添了限制。

If the stationary state of the process is stable, then the unreproducible fluctuations involve local transient decreases of entropy. The reproducible response of the system is then to increase the entropy back to its maximum by irreversible processes: the fluctuation cannot be reproduced with a significant level of probability. Fluctuations about stable stationary states are extremely small except near critical points (Kondepudi and Prigogine 1998, page 323).^[30] The stable stationary state has a local maximum of entropy and is locally the most reproducible state of the system. There are theorems about the irreversible dissipation of fluctuations. Here 'local' means local with respect to the abstract space of thermodynamic coordinates of state of the system.

If the stationary state of the process is stable, then the unreproducible fluctuations involve local transient decreases of entropy. The reproducible response of the system is then to increase the entropy back to its maximum by irreversible processes: the fluctuation cannot be reproduced with a significant level of probability. Fluctuations about stable stationary states are extremely small except near critical points (Kondepudi and Prigogine 1998, page 323). The stable stationary state has a local maximum of entropy and is locally the most reproducible state of the system. There are theorems about the irreversible dissipation of fluctuations. Here 'local' means local with respect to the abstract space of thermodynamic coordinates of state of the system.

如果这个过程的定态是稳定的，那么不可复制的涨落就包含了局部瞬时的熵减。然后系统的可重复响应是通过不可逆过程将熵重新增加到最大值: 涨落不可能以显著的概率再现。除了临界点附近，稳定定态的涨落极小(Kondepudi 和 Prigogine 1998,323页)。稳定的定态有一个局部最大熵，并且是系统局部最可再现的状态。关于涨落的不可逆耗散有几个定理。这里“局部”是指相对于系统状态热力学坐标的抽象空间的局部。

If the stationary state is unstable, then any fluctuation will almost surely trigger the virtually explosive departure of the system from the unstable stationary state. This can be accompanied by increased export of entropy.

如果定态是不稳定的，那么任何涨落几乎肯定会触发系统几乎爆炸性地偏离不稳定的定态。这可能伴随着熵输出的增加。

Local thermodynamic equilibrium

局部热力学平衡

The scope of present-day non-equilibrium thermodynamics does not cover all physical processes. A condition for the validity of many studies in non-equilibrium thermodynamics of matter is that they deal with what is known as local thermodynamic equilibrium.

The scope of present-day non-equilibrium thermodynamics does not cover all physical processes. A condition for the validity of many studies in non-equilibrium thermodynamics of matter is that they deal with what is known as local thermodynamic equilibrium.

目前非平衡态热力学的范围并不包括所有的物理过程。在物质的非平衡态热力学中，许多研究有效的一个条件是，他们处理的是所谓的局部热力学平衡。

Ponderable matter

有重量物质

Local thermodynamic equilibrium of matter^[8]^[15]^[24]^[25]^[26] (see also Keizer (1987)^[27] means that conceptually, for study and analysis, the system can be spatially and temporally divided into 'cells' or 'micro-phases' of small (infinitesimal) size, in which classical thermodynamical equilibrium conditions for matter are fulfilled to good approximation. These conditions are unfulfilled, for example, in very rarefied gases, in which molecular collisions are infrequent; and in the boundary layers of a star, where radiation is passing energy to space; and for interacting fermions at very low temperature, where dissipative processes become ineffective. When these 'cells' are defined, one admits that matter and energy may pass freely between contiguous 'cells', slowly enough to leave the 'cells' in their respective individual local thermodynamic equilibria with respect to intensive variables.

Local thermodynamic equilibrium of matter (see also Keizer (1987) means that conceptually, for study and analysis, the system can be spatially and temporally divided into 'cells' or 'micro-phases' of small (infinitesimal) size, in which classical thermodynamical equilibrium conditions for matter are fulfilled to good approximation. These conditions are unfulfilled, for example, in very rarefied gases, in which molecular collisions are infrequent; and in the boundary layers of a star, where radiation is passing energy to space; and for interacting fermions at very low temperature, where dissipative processes become ineffective. When these 'cells' are defined, one admits that matter and energy may pass freely between contiguous 'cells', slowly enough to leave the 'cells' in their respective individual local thermodynamic equilibria with respect to intensive variables.

物质的局部热力学平衡(参见 Keizer (1987))意味着，从概念上来说，为了研究和分析，系统可以在空间和时间上分割为小(无限小)尺寸的‘单元’或‘微相’ ，每个单元中物质的经典热力学平衡条件得在很好的近似下得以满足。经典热力学平衡条件对系统整体可能不能满足，例如在非常稀薄的气体中，分子碰撞很少发生; 在恒星的边界层中，辐射将能量传递到空间; 在非常低的温度下相互作用的费米子中，耗散过程变得无效。但是当我们定义这些“单元”时，人们承认物质和能量可以在相邻的“单元”之间自由通过，慢到足以在它们各自关于强度量的局部热力学平衡中离开“单元”。

One can think here of two 'relaxation times' separated by order of magnitude.^[31] The longer relaxation time is of the order of magnitude of times taken for the macroscopic dynamical structure of the system to change. The shorter is of the order of magnitude of times taken for a single 'cell' to reach local thermodynamic equilibrium. If these two relaxation times are not well separated, then the classical non-equilibrium thermodynamical concept of local thermodynamic equilibrium loses its meaning^[31] and other approaches have to be proposed, see for instance Extended irreversible thermodynamics. For example, in the atmosphere, the speed of sound is much greater than the wind speed; this favours the idea of local thermodynamic equilibrium of matter for atmospheric heat transfer studies at altitudes below about 60 km where sound propagates, but not above 100 km, where, because of the paucity of intermolecular collisions, sound does not propagate.

One can think here of two 'relaxation times' separated by order of magnitude. The longer relaxation time is of the order of magnitude of times taken for the macroscopic dynamical structure of the system to change. The shorter is of the order of magnitude of times taken for a single 'cell' to reach local thermodynamic equilibrium. If these two relaxation times are not well separated, then the classical non-equilibrium thermodynamical concept of local thermodynamic equilibrium loses its meaning and other approaches have to be proposed, see for instance Extended irreversible thermodynamics. For example, in the atmosphere, the speed of sound is much greater than the wind speed; this favours the idea of local thermodynamic equilibrium of matter for atmospheric heat transfer studies at altitudes below about 60km where sound propagates, but not above 100km, where, because of the paucity of intermolecular collisions, sound does not propagate.

你可以在这里想象一下两个被数量级分开的“弛豫时间”。较长的弛豫时间是系统宏观动力学结构改变所需时间的数量级。较短的一个数量级是单个“单元”到达局部热力学平衡所需的时间。如果这两个弛豫时间没有很好地分开，那么局部热力学平衡的经典非平衡热力学概念就失去了意义，必须提出其他方法，例如扩展的不可逆热力学。例如，在大气中，声速远远大于风速；这就支持在60公里以下高度的大气热传导研究中局部物质热力学平衡的想法，在这个高度范围内声音可以传播，但不能超过100公里，在那里由于分子间的碰撞，声音不能传播。

Milne's definition in terms of radiative equilibrium

米尔恩依据辐射平衡的定义

Edward A. Milne, thinking about stars, gave a definition of 'local thermodynamic equilibrium' in terms of the thermal radiation of the matter in each small local 'cell'.^[32] He defined 'local thermodynamic equilibrium' in a 'cell' by requiring that it macroscopically absorb and spontaneously emit radiation as if it were in radiative equilibrium in a cavity at the temperature of the matter of the 'cell'. Then it strictly obeys Kirchhoff's law of equality of radiative emissivity and absorptivity, with a black body source function. The key to local thermodynamic equilibrium here is that the rate of collisions of ponderable matter particles such as molecules should far exceed the rates of creation and annihilation of photons.

Edward A. Milne, thinking about stars, gave a definition of 'local thermodynamic equilibrium' in terms of the thermal radiation of the matter in each small local 'cell'. He defined 'local thermodynamic equilibrium' in a 'cell' by requiring that it macroscopically absorb and spontaneously emit radiation as if it were in radiative equilibrium in a cavity at the temperature of the matter of the 'cell'. Then it strictly obeys Kirchhoff's law of equality of radiative emissivity and absorptivity, with a black body source function. The key to local thermodynamic equilibrium here is that the rate of collisions of ponderable matter particles such as molecules should far exceed the rates of creation and annihilation of photons.

考虑到恒星，爱德华·亚瑟·米尔恩根据每个小局部“单元”中物质的热辐射，给出了局部热力学平衡的定义。他定义一个“单元”中的局部热力学平衡，要求它在宏观上吸收和自发放射辐射时，就好像它处于该“单元”中物质温度的辐射平衡中一样。然后使用一个黑体源函数，严格遵守基尔霍夫辐射发射率和吸收率相等的定律。这里局部热力学平衡的关键在于，像分子这样的有重量物质粒子的碰撞速率，应该远远超过光子的产生和湮灭速率。

Entropy in evolving systems

演化系统的熵

It is pointed out by W.T. Grandy Jr,^[33]^[34]^[35]^[36] that entropy, though it may be defined for a non-equilibrium system is—when strictly considered—only a macroscopic quantity that refers to the whole system, and is not a dynamical variable and in general does not act as a local potential that describes local physical forces. Under special circumstances, however, one can metaphorically think as if the thermal variables behaved like local physical forces. The approximation that constitutes classical irreversible thermodynamics is built on this metaphoric thinking.

It is pointed out by W.T. Grandy Jr, that entropy, though it may be defined for a non-equilibrium system is—when strictly considered—only a macroscopic quantity that refers to the whole system, and is not a dynamical variable and in general does not act as a local potential that describes local physical forces. Under special circumstances, however, one can metaphorically think as if the thermal variables behaved like local physical forces. The approximation that constitutes classical irreversible thermodynamics is built on this metaphoric thinking.

W.T. Grandy Jr 指出，熵虽然在非平衡系统中可以定义，但是严格来说，它只是一个关于整个系统的宏观量，而不是一个动力学变量，一般不作为描述局部力的局部势能。然而在特殊情况下，人们可以隐喻地认为，热力学变量表现得像局部物理力。构成经典不可逆热力学的近似是建立在这种隐喻思维之上的。

This point of view shares many points in common with the concept and the use of entropy in continuum thermomechanics,^[37]^[38]^[39]^[40] which evolved completely independently of statistical mechanics and maximum-entropy principles.

This point of view shares many points in common with the concept and the use of entropy in continuum thermomechanics, which evolved completely independently of statistical mechanics and maximum-entropy principles.

这种观点与连续热力学中熵的概念和使用有许多共同点，连续热力学的发展完全独立于统计力学和最大熵原理。

Entropy in non-equilibrium

非平衡中的熵

To describe deviation of the thermodynamic system from equilibrium, in addition to constitutive variables [math]\displaystyle{ x_1, x_2, ..., x_n }[/math] that are used to fix the equilibrium state, as was described above, a set of variables [math]\displaystyle{ \xi_1, \xi_2,\ldots }[/math] that are called internal variables have been introduced. The equilibrium state is considered to be stable and the main property of the internal variables, as measures of non-equilibrium of the system, is their trending to disappear; the local law of disappearing can be written as relaxation equation for each internal variable

To describe deviation of the thermodynamic system from equilibrium, in addition to constitutive variables [math]\displaystyle{ x_1, x_2, ..., x_n }[/math] that are used to fix the equilibrium state, as was described above, a set of variables [math]\displaystyle{ \xi_1, \xi_2,\ldots }[/math] that are called internal variables have been introduced. The equilibrium state is considered to be stable and the main property of the internal variables, as measures of non-equilibrium of the system, is their trending to disappear; the local law of disappearing can be written as relaxation equation for each internal variable

为了描述热力学系统偏离平衡状态，除了用于确定平衡状态的本构变量[math]\displaystyle{ x_1, x_2, ..., x_n }[/math] 之外，还引入了一组称为内部变量的变量 [math]\displaystyle{ \xi_1, \xi_2,\ldots }[/math] 。平衡态被认为是稳定的，内部变量作为系统非平衡的度量，其主要性质是它们趋于消失，消失的局部规律可以写成每个内变部量的弛豫方程

[math]\displaystyle{ {{NumBlk|:|\lt math\gt {{ NumBlk | : | \lt math \gt \frac{d\xi_i}{dt} = - \frac{1}{\tau_i} \, \left(\xi_i - \xi_i^{(0)} \right),\quad i =1,\,2,\ldots , \frac{d\xi_i}{dt} = - \frac{1}{\tau_i} \, \left(\xi_i - \xi_i^{(0)} \right),\quad i =1,\,2,\ldots , 1} ，左(xi-xi-xi _ i ^ {(0)}右) ，quad i = 1，，2，ldots, }[/math]

(1)

</math>|}}

[/math > | }

where [math]\displaystyle{ \tau_i= \tau_i(T, x_1, x_2, \ldots, x_n) }[/math] is a relaxation time of a corresponding variables. It is convenient to consider the initial value [math]\displaystyle{ \xi_i^0 }[/math] are equal to zero. The above equation is valid for small deviations from equilibrium; The dynamics of internal variables in general case is considered by Pokrovskii.^[41]

where [math]\displaystyle{ \tau_i= \tau_i(T, x_1, x_2, \ldots, x_n) }[/math] is a relaxation time of a corresponding variables. It is convenient to consider the initial value [math]\displaystyle{ \xi_i^0 }[/math] are equal to zero. The above equation is valid for small deviations from equilibrium; The dynamics of internal variables in general case is considered by Pokrovskii.

其中 [math]\displaystyle{ \tau_i= \tau_i(T, x_1, x_2, \ldots, x_n) }[/math] 是相应变量的弛豫时间。考虑初始值 [math]\displaystyle{ \xi_i^0 }[/math] 等于零是方便的。上述方程适用于偏离平衡较小的情况，Pokrovskii 考虑了一般情况下内部变量的动力学。

Entropy of the system in non-equilibrium is a function of the total set of variables

非平衡态系统的熵是所有变量集合的函数

[math]\displaystyle{ {{NumBlk|:|\lt math\gt {{ NumBlk | : | \lt math \gt S=S(T, x_1, x_2, , x_n; \xi_1, \xi_2, \ldots) S=S(T, x_1, x_2, , x_n; \xi_1, \xi_2, \ldots) S = s (t，x1，x2，，xn; xi _ 1，xi _ 2，ldots) }[/math]

(1)

</math>|}}

[/math > | }

The essential contribution to the thermodynamics of the non-equilibrium systems was brought by Prigogine, when he and his collaborators investigated the systems of chemically reacting substances. The stationary states of such systems exists due to exchange both particles and energy with the environment. In section 8 of the third chapter of his book,^[42] Prigogine has specified three contributions to the variation of entropy of the considered system at the given volume and constant temperature [math]\displaystyle{ T }[/math] . The increment of entropy [math]\displaystyle{ S }[/math] can be calculated according to the formula

The essential contribution to the thermodynamics of the non-equilibrium systems was brought by Prigogine, when he and his collaborators investigated the systems of chemically reacting substances. The stationary states of such systems exists due to exchange both particles and energy with the environment. In section 8 of the third chapter of his book, Prigogine has specified three contributions to the variation of entropy of the considered system at the given volume and constant temperature [math]\displaystyle{ T }[/math] . The increment of entropy [math]\displaystyle{ S }[/math] can be calculated according to the formula

对非平衡系统热力学的最重要贡献是由普利高津做出的，当时他和他的合作者研究了化学反应物质系统。由于与环境交换粒子和能量，这类系统的定态是存在的。在他的书的第三章的第8节中，普利高津详细说明了在给定体积和恒定温度[math]\displaystyle{ T }[/math] 下，被考虑系统的熵的变化有三种贡献。根据该公式可以计算出熵[math]\displaystyle{ S }[/math]的增量

[math]\displaystyle{ {{NumBlk|:|\lt math\gt {{ NumBlk | : | \lt math \gt T\,dS = \Delta Q - \sum_{j} \, \Xi_{j} \,\Delta \xi_j + \sum_{\alpha =1}^k\, \mu_\alpha \, \Delta N_\alpha. T\,dS = \Delta Q - \sum_{j} \, \Xi_{j} \,\Delta \xi_j + \sum_{\alpha =1}^k\, \mu_\alpha \, \Delta N_\alpha. T，dS = Delta q-sum { j } ，Xi { j } ，Delta Xi _ j + sum _ { alpha = 1} ^ k，mu _ alpha，Delta n _ alpha. }[/math]

(1)

</math>|}}

[/math > | }

The first term on the right hand side of the equation presents a stream of thermal energy into the system; the last term—a stream of energy into the system coming with the stream of particles of substances [math]\displaystyle{ \Delta N_\alpha }[/math] that can be positive or negative, [math]\displaystyle{ \mu_\alpha }[/math] is chemical potential of substance [math]\displaystyle{ \alpha }[/math]. The middle term in (1) depicts energy dissipation (entropy production) due to the relaxation of internal variables [math]\displaystyle{ \xi_j }[/math]. In the case of chemically reacting substances, which was investigated by Prigogine, the internal variables appear to be measures of incompleteness of chemical reactions, that is measures of how much the considered system with chemical reactions is out of equilibrium. The theory can be generalised,^[43]^[41] to consider any deviation from the equilibrium state as an internal variable, so that we consider the set of internal variables [math]\displaystyle{ \xi_j }[/math] in equation (1) to consist of the quantities defining not only degrees of completeness of all chemical reactions occurring in the system, but also the structure of the system, gradients of temperature, difference of concentrations of substances and so on.

The first term on the right hand side of the equation presents a stream of thermal energy into the system; the last term—a stream of energy into the system coming with the stream of particles of substances [math]\displaystyle{ \Delta N_\alpha }[/math] that can be positive or negative, [math]\displaystyle{ \mu_\alpha }[/math] is chemical potential of substance [math]\displaystyle{ \alpha }[/math]. The middle term in (1) depicts energy dissipation (entropy production) due to the relaxation of internal variables [math]\displaystyle{ \xi_j }[/math]. In the case of chemically reacting substances, which was investigated by Prigogine, the internal variables appear to be measures of incompleteness of chemical reactions, that is measures of how much the considered system with chemical reactions is out of equilibrium. The theory can be generalised, to consider any deviation from the equilibrium state as an internal variable, so that we consider the set of internal variables [math]\displaystyle{ \xi_j }[/math] in equation (1) to consist of the quantities defining not only degrees of completeness of all chemical reactions occurring in the system, but also the structure of the system, gradients of temperature, difference of concentrations of substances and so on.

方程式右边的第一项代表进入系统的热能; 最后一项为伴随着粒子进入系统而带来的能量流，粒子流[math]\displaystyle{ \Delta N_\alpha }[/math]可以是正的也可以是负的，[math]\displaystyle{ \mu_\alpha }[/math] 是物质[math]\displaystyle{ \alpha }[/math]的化学势。方程右边中间项描述了由于内部变量[math]\displaystyle{ \xi_j }[/math]的弛豫而引起的能量耗散(熵产生)。在普利高津研究的化学反应物质的情况下，内部变量看起来是测量化学反应的未完成度，也就是测量考虑的化学反应体系远离平衡的程度。这个理论可以推广，把任何对平衡态的偏离看作是内部变量，因此我们认为方程式(1)中的内部变量集合[math]\displaystyle{ \xi_j }[/math]不仅包含了定义系统中所有化学反应完成程度的量，而且还包含了系统的结构、温度梯度、物质浓度差等。

Flows and forces

流和力

The fundamental relation of classical equilibrium thermodynamics ^[44]

The fundamental relation of classical equilibrium thermodynamics

经典平衡态热力学的基本关系为

[math]\displaystyle{ dS=\frac{1}{T}dU+\frac{p}{T}dV-\sum_{i=1}^s\frac{\mu_i}{T}dN_i }[/math]

[math]\displaystyle{ dS=\frac{1}{T}dU+\frac{p}{T}dV-\sum_{i=1}^s\frac{\mu_i}{T}dN_i }[/math]

{ t } dU + frac { p }{ t } dV-sum { i = 1} ^ s frac { mu _ i }{ t } dN _ i </math >

expresses the change in entropy [math]\displaystyle{ dS }[/math] of a system as a function of the intensive quantities temperature [math]\displaystyle{ T }[/math], pressure [math]\displaystyle{ p }[/math] and [math]\displaystyle{ i^{th} }[/math] chemical potential [math]\displaystyle{ \mu_i }[/math] and of the differentials of the extensive quantities energy [math]\displaystyle{ U }[/math], volume [math]\displaystyle{ V }[/math] and [math]\displaystyle{ i^{th} }[/math] particle number [math]\displaystyle{ N_i }[/math].

表示系统熵的变化 [math]\displaystyle{ dS }[/math] 是强度量温度[math]\displaystyle{ T }[/math]、压强[math]\displaystyle{ p }[/math]、第i个化学势[math]\displaystyle{ \mu_i }[/math]以及广延量能量[math]\displaystyle{ U }[/math]、体积[math]\displaystyle{ V }[/math]、第i个粒子数目[math]\displaystyle{ N_i }[/math]的微分的函数。

Following Onsager (1931,I),^[10] let us extend our considerations to thermodynamically non-equilibrium systems. As a basis, we need locally defined versions of the extensive macroscopic quantities [math]\displaystyle{ U }[/math], [math]\displaystyle{ V }[/math] and [math]\displaystyle{ N_i }[/math] and of the intensive macroscopic quantities [math]\displaystyle{ T }[/math], [math]\displaystyle{ p }[/math] and [math]\displaystyle{ \mu_i }[/math].

Following Onsager (1931,I), let us extend our considerations to thermodynamically non-equilibrium systems. As a basis, we need locally defined versions of the extensive macroscopic quantities [math]\displaystyle{ U }[/math], [math]\displaystyle{ V }[/math] and [math]\displaystyle{ N_i }[/math] and of the intensive macroscopic quantities [math]\displaystyle{ T }[/math], [math]\displaystyle{ p }[/math] and [math]\displaystyle{ \mu_i }[/math].

跟随昂萨格(1931，I)，让我们扩展到热力学非平衡系统。作为基础，我们需要定义宏观广延量 [math]\displaystyle{ U }[/math]、[math]\displaystyle{ V }[/math]、[math]\displaystyle{ N_i }[/math]和宏观强度量[math]\displaystyle{ T }[/math], [math]\displaystyle{ p }[/math] 、 [math]\displaystyle{ \mu_i }[/math]的局部版本。

For classical non-equilibrium studies, we will consider some new locally defined intensive macroscopic variables. We can, under suitable conditions, derive these new variables by locally defining the gradients and flux densities of the basic locally defined macroscopic quantities.

对于经典的非平衡研究，我们将考虑一些新定义的局部宏观强度量。我们可以在适当的条件下，通过局部定义基本局部宏观量的梯度和流密度，导出这些新的变量。

Such locally defined gradients of intensive macroscopic variables are called 'thermodynamic forces'. They 'drive' flux densities, perhaps misleadingly often called 'fluxes', which are dual to the forces. These quantities are defined in the article on Onsager reciprocal relations.

这种局部定义的宏观强度量的梯度被称为“热力学力”。它们“驱动”流密度，也许常被误称为“流” ，这是双重的力。这些量在关于昂萨格倒易关系的文章中有定义。

Establishing the relation between such forces and flux densities is a problem in statistical mechanics. Flux densities ([math]\displaystyle{ J_i }[/math]) may be coupled. The article on Onsager reciprocal relations considers the stable near-steady thermodynamically non-equilibrium regime, which has dynamics linear in the forces and flux densities.

建立这种力和流密度之间的关系是一个统计力学的问题。流密度(< math > j _ i </math >)可能是耦合的。昂萨格倒易关系的文章考虑了稳定的近定态热力学非平衡态，其中力和流密度具有线性动力学性质。

In stationary conditions, such forces and associated flux densities are by definition time invariant, as also are the system's locally defined entropy and rate of entropy production. Notably, according to Ilya Prigogine and others, when an open system is in conditions that allow it to reach a stable stationary thermodynamically non-equilibrium state, it organizes itself so as to minimize total entropy production defined locally. This is considered further below.

在稳态条件下，这样的力和对应的流密度根据定义是不随时间变化的，就像系统的局部定义的熵和熵产生率一样。值得注意的是，根据普利高津和其他人的研究，当一个开放系统处于允许它达到稳定的热力学非平衡状态的条件下时，它会自我组织以使局部定义的总熵产生最小化。下文将进一步讨论这个问题。

One wants to take the analysis to the further stage of describing the behaviour of surface and volume integrals of non-stationary local quantities; these integrals are macroscopic fluxes and production rates. In general the dynamics of these integrals are not adequately described by linear equations, though in special cases they can be so described.

人们想要进一步分析非静态局部量的表面和体积积分的行为，这些积分是宏观的流和产生率。一般来说，这些积分的动力学用线性方程不能充分描述，尽管在特殊情况下它们可以这样描述。

Onsager reciprocal relations

昂萨格倒易关系

Following Section III of Rayleigh (1873),^[9] Onsager (1931, I)^[10] showed that in the regime where both the flows ([math]\displaystyle{ J_i }[/math]) are small and the thermodynamic forces ([math]\displaystyle{ F_i }[/math]) vary slowly, the rate of creation of entropy [math]\displaystyle{ (\sigma) }[/math] is linearly related to the flows:

Following Section III of Rayleigh (1873), Onsager (1931, I) showed that in the regime where both the flows ([math]\displaystyle{ J_i }[/math]) are small and the thermodynamic forces ([math]\displaystyle{ F_i }[/math]) vary slowly, the rate of creation of entropy [math]\displaystyle{ (\sigma) }[/math] is linearly related to the flows:

在瑞利(1873)第三部分之后，昂萨格(1931，i)指出，在流(< math > j _ i </math >)较小且热力学力(< math > f _ i </math >)变化缓慢的情况下，熵的产生率[math]\displaystyle{ (\sigma) }[/math]与流呈线性关系:

[math]\displaystyle{ \sigma = \sum_i J_i\frac{\partial F_i}{\partial x_i} }[/math]

[数学][数学]

and the flows are related to the gradient of the forces, parametrized by a matrix of coefficients conventionally denoted [math]\displaystyle{ L }[/math]:

并且流与力的梯度有关，通过一个系数矩阵参数化，通常表示为:

[math]\displaystyle{ J_i = \sum_{j} L_{ij} \frac{\partial F_j}{\partial x_j} }[/math]

from which it follows that:

由此可见:

[math]\displaystyle{ \sigma = \sum_{i,j} L_{ij} \frac{\partial F_i}{\partial x_i}\frac{\partial F_j}{\partial x_j} }[/math]

The second law of thermodynamics requires that the matrix [math]\displaystyle{ L }[/math] be positive definite. Statistical mechanics considerations involving microscopic reversibility of dynamics imply that the matrix [math]\displaystyle{ L }[/math] is symmetric. This fact is called the Onsager reciprocal relations.

The second law of thermodynamics requires that the matrix [math]\displaystyle{ L }[/math] be positive definite. Statistical mechanics considerations involving microscopic reversibility of dynamics imply that the matrix [math]\displaystyle{ L }[/math] is symmetric. This fact is called the Onsager reciprocal relations.

热力学第二定律要求矩阵[math]\displaystyle{ L }[/math]是正定的。统计力学动力学的微观可逆性的考虑暗示了矩阵是对称的。这个事实被称为昂萨格倒易关系。

The generalization of the above equations for the rate of creation of entropy was given by Pokrovskii.^[41]

The generalization of the above equations for the rate of creation of entropy was given by Pokrovskii.

上述熵产生率方程的推广由 Pokrovskii 给出。

Speculated extremal principles for non-equilibrium processes

推测非平衡过程的极值原理

Until recently, prospects for useful extremal principles in this area have seemed clouded. Nicolis (1999)^[45] concludes that one model of atmospheric dynamics has an attractor which is not a regime of maximum or minimum dissipation; she says this seems to rule out the existence of a global organizing principle, and comments that this is to some extent disappointing; she also points to the difficulty of finding a thermodynamically consistent form of entropy production. Another top expert offers an extensive discussion of the possibilities for principles of extrema of entropy production and of dissipation of energy: Chapter 12 of Grandy (2008)^[2] is very cautious, and finds difficulty in defining the 'rate of internal entropy production' in many cases, and finds that sometimes for the prediction of the course of a process, an extremum of the quantity called the rate of dissipation of energy may be more useful than that of the rate of entropy production; this quantity appeared in Onsager's 1931^[10] origination of this subject. Other writers have also felt that prospects for general global extremal principles are clouded. Such writers include Glansdorff and Prigogine (1971), Lebon, Jou and Casas-Vásquez (2008), and Šilhavý (1997).

Until recently, prospects for useful extremal principles in this area have seemed clouded. Nicolis (1999) concludes that one model of atmospheric dynamics has an attractor which is not a regime of maximum or minimum dissipation; she says this seems to rule out the existence of a global organizing principle, and comments that this is to some extent disappointing; she also points to the difficulty of finding a thermodynamically consistent form of entropy production. Another top expert offers an extensive discussion of the possibilities for principles of extrema of entropy production and of dissipation of energy: Chapter 12 of Grandy (2008) is very cautious, and finds difficulty in defining the 'rate of internal entropy production' in many cases, and finds that sometimes for the prediction of the course of a process, an extremum of the quantity called the rate of dissipation of energy may be more useful than that of the rate of entropy production; this quantity appeared in Onsager's 1931 origination of this subject. Other writers have also felt that prospects for general global extremal principles are clouded. Such writers include Glansdorff and Prigogine (1971), Lebon, Jou and Casas-Vásquez (2008), and Šilhavý (1997).

直到最近，这个领域中有用的极端原理的前景似乎还很模糊。Nicolis (1999)得出结论，大气动力学的一个模型有一个吸引子，它不是最大或最小耗散的范畴; 她说这似乎排除了全局组织原则的存在，并评论说，这在某种程度上是令人失望的; 她还指出，很难找到一个热力学上一致的形式的熵产生。另一位顶级专家对熵产生极值原理和能量耗散原理的可能性进行了广泛的讨论: Grandy (2008年)的第12章非常谨慎，发现在许多情况下难以定义“内部熵产生速率”，并发现有时为了预测一个过程的进程，一个叫做能量耗散速率的极值可能比熵产生的速率更有用; 这个量出现在昂萨格尔1931年创立的这个主题中。其他研究者也认为，一般的全局极值原理的前景是模糊的。这些作家包括格兰斯多夫和普里戈金(1971年)、莱邦、乔和卡萨斯-瓦斯奎斯(2008年) ，以及伊尔哈维(1997年)。

A recent proposal may perhaps bypass those clouded prospects.^[46]^[47]

A recent proposal may perhaps bypass those clouded prospects.

最近的一项提议或许可以绕过这些阴云密布的前景。

Applications

应用

Non-equilibrium thermodynamics has been successfully applied to describe biological processes such as protein folding/unfolding and transport through membranes.^[48]^[49]

Non-equilibrium thermodynamics has been successfully applied to describe biological processes such as protein folding/unfolding and transport through membranes.

非平衡态热力学已成功地应用于描述蛋白质折叠/展开和膜转运等生物学过程。

It is also used to give a description of the dynamics of nanoparticles, which can be out of equilibrium in systems where catalysis and electrochemical conversion is involved.^[50]

It is also used to give a description of the dynamics of nanoparticles, which can be out of equilibrium in systems where catalysis and electrochemical conversion is involved.

它也被用来描述纳米颗粒的动力学，在涉及催化和电化学转化的系统中，纳米颗粒可以远离热力学平衡。

Also, ideas from non-equilibrium thermodynamics and the informatic theory of entropy have been adapted to describe general economic systems.^[51]

Also, ideas from non-equilibrium thermodynamics and the informatic theory of entropy have been adapted to describe general economic systems.

此外，来自非平衡态热力学的思想和熵的信息论已经被用来描述一般的经济系统。

^[52]

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Lieb, E.H., Yngvason, J. (1999). 'The physics and mathematics of the second law of thermodynamics', Physics Reports, 310: 1–96. See also this.

External links

Stephan Herminghaus' Dynamics of Complex Fluids Department at the Max Planck Institute for Dynamics and Self Organization

Non-equilibrium Statistical Thermodynamics applied to Fluid Dynamics and Laser Physics - 1992- book by Xavier de Hemptinne.

Nonequilibrium Thermodynamics of Small Systems - PhysicsToday.org

Into the Cool - 2005 book by Dorion Sagan and Eric D. Schneider, on nonequilibrium thermodynamics and evolutionary theory.

Thermodynamics ‘‘beyond local equilibrium

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分类: 热力学的分支

This page was moved from wikipedia:en:Non-equilibrium thermodynamics. Its edit history can be viewed at 非平衡态热力学/edithistory

[1] Bodenschatz, Eberhard; Cannell, David S.; de Bruyn, John R.; Ecke, Robert; Hu, Yu-Chou; Lerman, Kristina; Ahlers, Guenter (December 1992). "Experiments on three systems with non-variational aspects". Physica D: Nonlinear Phenomena. 61 (1–4): 77–93. doi:10.1016/0167-2789(92)90150-L.

[Grandy_2008-2] 2.0 ^2.1 Grandy, W.T., Jr (2008).

[Lebon_Jou_Casas-V.C3.A1zquez_2008-3] 3.0 ^3.1 ^3.2 ^3.3 Lebon, G., Jou, D., Casas-Vázquez, J. (2008). Understanding Non-equilibrium Thermodynamics: Foundations, Applications, Frontiers, Springer-Verlag, Berlin, e-
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[EY_5-4] 4.0 ^4.1 Lieb, E.H., Yngvason, J. (1999), p. 5.

[5] Gyarmati, I. (1967/1970), pp. 8–12.

[6] Callen, H.B. (1960/1985), § 4–2.

[7] Glansdorff, P., Prigogine, I. (1971), Ch. $II$ ,§ 2.

[Gyarmati_1970-8] 8.0 ^8.1 ^8.2 ^8.3 Gyarmati, I. (1967/1970).

[Rayleigh_1873-9] 9.0 ^9.1 Strutt, J. W. (1871). "Some General Theorems relating to Vibrations". Proceedings of the London Mathematical Society. s1-4: 357–368. doi:10.1112/plms/s1-4.1.357.

[Onsager_1931_I-10] 10.0 ^10.1 ^10.2 ^10.3 ^10.4 Onsager, L. (1931). "Reciprocal relations in irreversible processes, I". Physical Review. 37 (4): 405–426. Bibcode:1931PhRv...37..405O. doi:10.1103/PhysRev.37.405.

[Lavenda_1978-11] 11.0 ^11.1 ^11.2 ^11.3 Lavenda, B.H. (1978). Thermodynamics of Irreversible Processes, Macmillan, London,
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[12] Gyarmati, I. (1967/1970), pages 4-14.

[Ziegler_1983-13] Ziegler, H., (1983). An Introduction to Thermomechanics, North-Holland, Amsterdam,
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[Balescu-14] Balescu, R. (1975). Equilibrium and Non-equilibrium Statistical Mechanics, Wiley-Interscience, New York,
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Category
, Section 3.2, pages 64-72.

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[G.26P_1971-15] 15.0 ^15.1 ^15.2 Glansdorff, P., Prigogine, I. (1971). Thermodynamic Theory of Structure, Stability, and Fluctuations, Wiley-Interscience, London, 1971,
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[JCVL_1993-16] 16.0 ^16.1 Jou, D., Casas-Vázquez, J., Lebon, G. (1993). Extended Irreversible Thermodynamics, Springer, Berlin,
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[17] Eu, B.C. (2002).

[Wildt_1972-18] Wildt, R. (1972). "Thermodynamics of the gray atmosphere. IV. Entropy transfer and production". Astrophysical Journal. 174: 69–77. Bibcode:1972ApJ...174...69W. doi:10.1086/151469.

[Essex_1984a-19] Essex, C. (1984a). "Radiation and the irreversible thermodynamics of climate". Journal of the Atmospheric Sciences. 41 (12): 1985–1991. Bibcode:1984JAtS...41.1985E. doi:10.1175/1520-0469(1984)041<1985:RATITO>2.0.CO;2..

[Essex_1984b-20] Essex, C. (1984b). "Minimum entropy production in the steady state and radiative transfer". Astrophysical Journal. 285: 279–293. Bibcode:1984ApJ...285..279E. doi:10.1086/162504.

[Essex_1984c-21] Essex, C. (1984c). "Radiation and the violation of bilinearity in the irreversible thermodynamics of irreversible processes". Planetary and Space Science. 32 (8): 1035–1043. Bibcode:1984P&SS...32.1035E. doi:10.1016/0032-0633(84)90060-6.

[22] Prigogine, I., Defay, R. (1950/1954). Chemical Thermodynamics, Longmans, Green & Co, London, page 1.

[De_Groot_Mazur_1962-23] 23.0 ^23.1 De Groot, S.R., Mazur, P. (1962). Non-equilibrium Thermodynamics, North-Holland, Amsterdam.

[Balescu_1975-24] 24.0 ^24.1 Balescu, R. (1975). Equilibrium and Non-equilibrium Statistical Mechanics, John Wiley & Sons, New York,
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[Mihalas_Mihalas_1984-25] 25.0 ^25.1 Mihalas, D., Weibel-Mihalas, B. (1984). Foundations of Radiation Hydrodynamics, Oxford University Press, New York
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非平衡态热力学

目录

Scope

Difference between equilibrium and non-equilibrium thermodynamics

Non-equilibrium state variables

Overview

Quasi-radiationless non-equilibrium thermodynamics of matter in laboratory conditions

Local equilibrium thermodynamics

Local equilibrium thermodynamics with materials with "memory"

Extended irreversible thermodynamics

Basic concepts

Stationary states, fluctuations, and stability

Local thermodynamic equilibrium

Ponderable matter

Milne's definition in terms of radiative equilibrium

Entropy in evolving systems

Entropy in non-equilibrium

Flows and forces

Onsager reciprocal relations

Speculated extremal principles for non-equilibrium processes

Applications

See also

References

Sources

Further reading

External links

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