泡沫金属结构内流体流动与传热性能数值模拟  

Numerical simulation on fluid flow and heat transfer performance of metal-foam structures

作　　者：黄媛媛[1] 周帼彦[1] 王俊涛[1] 肖敬美 王正东[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9期16-20,共5页Chemical Engineering(China)

摘　　要：基于开孔泡沫金属的微观结构分析,文中提出了一种简化的六面体结构模型,并采用商用软件FLUENT14.0模拟分析了三维矩形通道内泡沫金属与空气的对流换热情况,进一步分析了结构参数对泡沫金属内部流动与换热特性的影响关系。研究结果表明:通过与Alvarez实验结果的对比,分析验证了文中提出的简化模型是可行、准确的;传热因子j和摩擦因子f随着雷诺数和孔隙率的增大而减小,随着孔密度的增大而增大;相对而言,大孔径的泡沫金属的对流换热综合性能较好。Based on the micro structure of open-cell metal foams, a simplified hexahedral structure model of open- cell metal foams was proposed herein. The fluid flow and heat transfer performance was numerically simulated by using the commercial software FLUENT14.0 for a rectangular passage filled with metal-foams. The influence of structural parameters on the flow and heat transfer characteristics of metal-foam was analyzed. The results show that the calculated convection heat transfer coefficient and pressure gradient are in good agreement with those measured by Alvarez. It indicates that the model proposed is reliable and accurate. As the cell density increases, the heat transfer factor j and the friction factor f increase. But with the increase of Reynolds number and porosity of metal foams, both the heat transfer factorj and friction factorf decrease. To some extent, the comprehensive heat transfer performance of metal foams with a lower pore density is relatively better.

关 键 词：泡沫金属 对流换热 数值模拟 计算流体动力学 

分 类 号：TK124[动力工程及工程热物理—工程热物理]