板-泡式换热器传热及阻力特性数值模拟  

Numerical simulation on heat transfer and resistance characteristics of plate-foam heat exchanger

作　　者：王俊涛[1] 周帼彦[1] 肖敬美 黄媛媛[1] 涂善东[1] 

机构地区：[1]华东理工大学机械与动力工程学院承压系统与安全教育部重点实验室,上海200237

出　　处：《化学工程》2015年第7期33-38,共6页Chemical Engineering(China)

基　　金：上海市浦江人才计划资助项目(14PJD015)

摘　　要：开孔泡沫金属由于其复杂的三维网状结构,当流体通过时会发生非线性扰动,湍流程度增强,使得泡沫金属和流体之间发生强迫对流换热,基于开孔泡沫金属能强化传热的特性开发了高效紧凑的板-泡式换热器。利用FLUENT多孔介质模型对板-泡式换热器的传热及阻力特性进行数值模拟。研究结果表明:在导热隔板间填充铝泡沫金属,换热器的传热效率明显提高;在相同速度下,换热效率随孔隙率的增大而减小;努塞尔数随着流道高度的增加而增大,且随着雷诺数的增大,其影响越来越明显。同时以数值计算结果为基础,拟合得到400<Re<4 000范围内努塞尔数以及阻力系数准则关系式。研究结果可为板-泡式换热器的结构优化和设计制造紧凑换热设备提供参考。The complex three-dimensional network structure of open-cell metal foam can enhance the nonlinear effect when fluid flow through the foam. The enhancement of the turbulence can strengthen the forced convective heat transfer between the fluid and foam metal. Based on the characteristics of heat transfer enhancement, open-cell metal foam was used to develop plate-foam heat exchangers which are highly effective and compact. The heat transfer and the resistance characteristics of heat exchanger were numerically simulated using FLUENT. The simulation results show that filling with aluminum foam in thermal conductive plate can improve the coefficient of the heat exchanger. At the same Reynolds number, heat transfer efficiency is improved with the decrease of the porosity. Nusseh number increases with the increase of flow channel height, and with the increase of Reynolds number, its influence is more and more obvious. The correlations for calculating the Nusselt number and friction coefficient in the range of 400 〈 Re 〈 4 000 are also fitted based on the numerical calculation results. The research results can be reference for structure optimization design and performance analysis of heat transfer equipment.

关 键 词：开孔泡沫金属 板-泡式换热器 多孔介质模型 传热 阻力 准则关系式 

分 类 号：TK172[动力工程及工程热物理—热能工程]