热质的运动和传递——热子气的守恒方程和傅立叶定律  

MOTION AND TRANSFER OF THERMAL MASS—CONSERVATION EQUATIONS OF THERMON GAS AND FOURIER'S LAW

作　　者：过增元[1] 朱宏晔[1] 

机构地区：[1]清华大学工程力学系传热与能源利用北京市重点实验室,北京100084

出　　处：《工程热物理学报》2007年第1期86-88,共3页Journal of Engineering Thermophysics

摘　　要：本文在热质和热子气概念的基础上建立了热子气的质量、动量、能量守恒方程。基于傅立叶导热定律求得了热子气粘性系数和粘性力的近似表达式。分析了傅立叶定律的物理意义:傅立叶定律是在忽略惯性力的条件下对热子气动量方程的近似。在极低温度或极高热流密度条件下傅立叶定律不再适用。Based on the concepts of thermal mass and thermon gas the conservation equations of thermon gas including mass, momentum and energy conservation equation were derived in this paper. From Fourier＇s law the viscosity coefficient of thermon gas was obtained. The analyses show that Fourier＇s law is the simplified momentum conservation equation of thermon gas with ignoring the inertia of thermon gas. Fourier＇s law is no longer applicable in the problems with extreme low temperature or extreme high heat current density.

关 键 词：热质 热子气 傅立叶定律 

分 类 号：TK124[动力工程及工程热物理—工程热物理]