恒热流工况下管内对流换热火用传递特性  

Exergy transfer characteristics of forced convective heat transfer through a smooth duct subjected to constant heat flux

作　　者：吴双应[1] 陈燕[1] 李友荣[1] 曾丹苓[1] 

机构地区：[1]重庆大学动力工程学院,重庆400044

出　　处：《化工学报》2006年第3期509-514,共6页CIESC Journal

摘　　要：从管内传热与流动的特点出发,基于热力学第一、第二定律和非平衡热力学理论,对壁面恒热流工况下,管内充分发展段对流换热的火用传递过程进行了研究,定义了对流换热传火用系数、火用流密度、传火用Nusselt数和对流换热火用传递方程,并导出相应的计算式;讨论了Reynolds数、量纲1热通量和不同截面位置等参数对对流换热火用传递过程的影响;最后将传火用和传热的结果进行了比较.Based on the first and second laws of thermodynamics and the theory of non-equilibrium thermodynamics, a new systematic approach to studying the exergy transfer processes of forced convective heat transfer through a duct with constant heat flux for fully developed turbulent flow was introduced. The local and mean convective exergy transfer coefficient, exergy flux, exergy-transfer Nusselt number were defined and the equation of convective exergy transfer rate was developed and their new generalized expressions were derived. By reference to a smooth duct, the numerical results of exergy transfer characteristics were obtained, and the effects of Reynolds number, non-dimensional heat flux and different cross-sectional locations in the duct on exergy transfer process were analyzed. In addition, a comparison of the results of exergy transfer with that of energy transfer was also discussed.

关 键 词：对流换热 恒热流 [火用]传递 能量传递 

分 类 号：TK124[动力工程及工程热物理—工程热物理]