用于低温余热回收系统热管换热器传热性能的数值模拟  

Numerical simulation of heat transfer performance for low temperature waste heat recovery system of heat pipe heat exchanger

作　　者：王芹[1] 王晓燕[1] 刘铁铮[1] 张俊[1] 王红 

机构地区：[1]内蒙古工业大学化工学院,内蒙古呼和浩特010051

出　　处：《现代化工》2014年第11期151-154,共4页Modern Chemical Industry

基　　金：内蒙古科技厅软科学研究计划(20130611);内蒙古工业大学校科学研究基金重点项目(ZD200908)

摘　　要：采用CFX软件Fluent模拟了用于低温余热回收的重力热管内的相变情况及充液率、热管长度比、管中心距对热管换热器传热性能的影响.模拟结果显示,水量一定时,加热段与冷凝段长度相同的热管在不同充液率条件下的传热特性,高充液率的传热能力优于低充液率的传热能力,适宜的充液率为60％～ 70％.当充液率一定时,加热段的长度小于冷凝段的长度有利于热管传热.当充液率及管长一定时,热管换热器的传热系数随管中心距的增大而减小.将热管换热器数值模拟的总传热系数与理论计算的结果进行对比,实现了特定体系热管换热器的结构优化.The influences of phase change, filling rate, length ratio of heat pipe and tube center distance in the gravity assisted heat pipe on the heat transfer performance of low temperature waste heat recovery system are simulated by using Fluent of CFX software. The results show that when the water volume is constant and the filling rate is 60% - 70% ,for the heat pipe with the same heating and condensation section,the high filling rate is beneficial to obtain the superior heat transfer capability. When the filling rate is constant, the shorter heat section than that of condensation one is helpful to heat transfer of heat pipe. When the filling rate and pipe length are constant, the heat transfer coefficient will decrease as the increase in tube center distance. The structure of specific heat pipe exchanger is optimized through the comparison of total heat transfer coefficient and theoretical calculation result of heat pipe exchanger＇ s numerical simulation.

关 键 词：热管 加热段 冷却段 充液率 传热 管中心距 

分 类 号：TK172.4[动力工程及工程热物理—热能工程]