Entransy decrease principle of heat transfer in an isolated system

作     者：CHENG XueTao LIANG XinGang GUO ZengYuan 

作者机构：Key Laboratory for Thermal Science and Power Engineering of Ministry of Education School of Aerospace Tsinghua University Beijing 100084China 

出 版 物：《Chinese Science Bulletin》 (中国科学通报)

年 卷 期：2011年第56卷第9期

页      面：847-854页

核心收录：

学科分类：0711[理学-系统科学] 12[管理学] 080701[工学-工程热物理] 1201[管理学-管理科学与工程(可授管理学、工学学位)] 07[理学] 08[工学] 0807[工学-动力工程及工程热物理] 0811[工学-控制科学与工程] 081103[工学-系统工程] 

基　　金：supported by Tsinghua University Initiative Scientific Research Program 

主　　题：孤立系统 传热原理 热力学第二定律 熵增加原理 封闭系统 平衡系统 平衡条件 时间箭头 

摘      要：The entropy increase principle for an isolated system and the criteria of thermal equilibrium for an isolated system and systems with prescribed temperature and volume can be derived on the basis of the concept of entropy and the first and second laws of thermodynamics. In this paper, the entransy decrease principle for an isolated system is introduced on the basis of the concept of entransy. It is found that the entransy of an isolated system always decreases during heat transfer. This principle can be taken as an expression of the second law of thermodynamics for heat transfer. The thermal equilibrium criteria for an isolated system and a closed system are also introduced. It is found that when an isolated system reaches thermal equilibrium, its entransy is a minimum value. This criterion is referred to as the minimum entransy principle. When a closed system reaches thermal equilibrium, its free entransy is also a minimum value. This criterion is referred to as the minimum free entransy principle. Therefore, like entropy, entransy can be considered an arrow of time in heat transfer and used to describe the thermal equilibrium state.