基本对流换热过程的熵产分析

Convective Heat Transfer by Entropy Generation

本文基于热力学第一及第二定律建立了对流换热过程的熵产关系式,并以此对几种基本的对流换热过程进行性能分析,得出其优化的过程参数。文中提出的无因次熵产数较之已有文献中的更为简明。

Based on the first and second law of thermodynamics, the irreversibility of convective heat transfer process is discussed and a general expression for entropy generation is derived, which is capable of reflecting the behaviour of both the fluid flow and the heat transfer. It can be used as an objective function to find the optimal parameters for heat transfer. Several main convective heat transfer processes are analyzed and the variation of theentropy generation as well as the optimal values of Reynold's number for each process has been determined. The nondimensional numbers of entropy generation proposed are simple in form, clear in physical meaning, and easy to use in engineering practice.