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arXiv 1906.07022cond-mat.stat-mech
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热传导系统的整体热力学

Global Thermodynamics for Heat Conduction Systems

Naoko Nakagawa, Shin-ichi Sasa

摘要:

提出了空间非均匀热传导系统的全局温度概念。有了这个新的量,我们提出了一个扩展的框架,整个系统的热力学,热力学的基本关系,我们称之为“整体热力学”的热传导系统。与此相关的整体热力学,我们制定了一个变分原理确定的热传导中的液-气相共存的热力学性质,这对应于自然扩展的麦克斯韦结构的平衡系统。我们定量预测了液-气界面温度偏离平衡转变温度。这一结果表明,过冷气体稳定地出现在界面附近。

英文摘要:

We propose the concept of global temperature for spatially non-uniform heat conduction systems. With this novel quantity, we present an extended framework of thermodynamics for the whole system such that the fundamental relation of thermodynamics holds, which we call "global thermodynamics" for heat conduction systems. Associated with this global thermodynamics, we formulate a variational principle for determining thermodynamic properties of the liquid-gas phase coexistence in heat conduction, which corresponds to the natural extension of the Maxwell construction for equilibrium systems. We quantitatively predict that the temperature of the liquid-gas interface deviates from the equilibrium transition temperature. This result indicates that a super-cooled gas stably appears near the interface.

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