变比热容介质中的非傅立叶瞬态导热  

NON-FOURIER UNSTEADY STATE HEAT CONDUCTION IN VARIABLE SPECIFIC HEAT CAPACITY MEDIA

作　　者：吴晶[1] 柳雄斌[1] 过增元[1] 

机构地区：[1]清华大学航天航空学院,热科学与动力工程教育部重点实验室,北京100084

出　　处：《工程热物理学报》2008年第9期1531-1533,共3页Journal of Engineering Thermophysics

基　　金：国家重点基础研究发展规划资助项目(No.2007CB206901)

摘　　要：基于导热过程中煅的概念,建立了(火积)平衡方程。结果表明:当导热介质的比热容为常数时,(火积)平衡方程和能量守恒方程联立可以得到傅立叶导热定律;当导热介质的比热容随温度变化时,在瞬态导热情况下傅立叶定律失效,表现出明显的非傅立叶效应。用数值模拟定量地研究了非傅立叶效应对于变比热容介质瞬态导热过程的影响。Based on the concept of entransy in heat conduction processes,the entransy balance equation was introduced.The theoretical results show that Fourier s law can be derived on the basis of entransy balance equation and energy conservation equation when the specific heat capacities of media are constant.However,for unsteady state heat conduction,the variable heat capacity may lead to non-Fourier effect and thus Fourier s law is not valid.Finally,the influence of non-Fourier effect on unsteady state heat conduct...

关 键 词：非傅立叶效应 变比热容 瞬态导热 

分 类 号：TK124[动力工程及工程热物理—工程热物理]