Relationship between microstate number and available entransy  

作　　者：CHENG XueTao LIANG XinGang 

机构地区：[1]Key Laboratory for Thermal Science and Power Engineering of Ministy of Education,Department of Engineering Mechanics,TsinghuaUniversity,Beijing 100084,China

出　　处：《Chinese Science Bulletin》2012年第24期3244-3250,共7页

基　　金：supported by the National Natural Science Foundation of China (51106082);the Tsinghua University Initiative Scientific Research Program

摘　　要：Based on the relationship between entransy and microstate number, we discuss the variations of the available transport entransy, the unavailable transport entransy, the available conversion entransy and the unavailable conversion entransy with the microstate number. We focus on physical processes in which heat is used for heating/cooling or doing work. When heat is transported for heating or cooling, the available transport entransy increases if the increase in microstate number is due to the increase in internal energy of the system, and decreases if the increase in microstate number is due to spontaneous heat transfer. When heat is used to do work, both the available conversion entransy and the unavailable conversion entransy increase if the increase in microstate number relates to the growth in internal energy of the system. The available conversion entransy decreases and the unavailable conversion entransy increases if the increase in microstate number results from spontaneous heat transfer.Based on the relationship between entransy and microstate number, we discuss the variations of the available transport entransy, the unavailable transport entransy, the available conversion entransy and the unavailable conversion entransy with the microstate number. We focus on physical processes in which heat is used for heating/cooling or doing work. When heat is transported for heating or cooling, the available transport entransy increases if the increase in microstate number is due to the increase in internal energy of the system, and decreases if the increase in microstate number is due to spontaneous heat transfer. When heat is used to do work, both the available conversion entransy and the unavailable conversion entransy increase if the increase in microstate number relates to the growth in internal energy of the system. The available conversion entransy decreases and the unavailable conversion entransy increases if the increase in microstate number results from spontaneous heat transfer.

关 键 词：微观状态数 物理过程 在系统 热传导 传输 冷却 加热 热量 

分 类 号：O551.3[理学—热学与物质分子运动论]