基于六面体模型的开孔泡沫金属强化传热机理  

Heat transfer enhancement mechanism of open-cell metal-foam structures based on hexahedral structure model

作　　者：史燕华[1] 周帼彦[1] 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试验室,上海200237

出　　处：《化学工程》2016年第11期23-29,共7页Chemical Engineering(China)

基　　金：上海市浦江人才计划资助项目(14PJD015)

摘　　要：由于在结构和强化传热方面的优越性,开孔泡沫金属在热交换方面具有广泛的应用前景。基于一种简化的六面体结构模型,采用商用软件FLUENT14.0模拟分析了三维矩形通道内泡沫金属流场分布情况,探讨了其强化传热机理。研究结果表明:流体流经泡沫金属时,其速度、温度、压力均呈周期性变化。流体在泡沫金属内速度不断增加,在骨架前部流速突然降低,雷诺数增加,流速跳跃的振幅增大;高温流体流进泡沫金属时,温度先缓慢地升高,在流经泡沫金属骨架后迅速下降,雷诺数越大,流体的温度越高,靠近骨架壁面的温度也越高;流体流经骨架时,压力骤降且在骨架后部形成涡流;其换热能力和压降随着孔密度的增大而增大,随着孔隙率的增大而减小。Due to the advantages of the structure and heat exchanger,open-cell metal foam has a great potential application in the heat exchanger industries. Based on the simplified hexahedral structure model,the fluid flow,heat transfer performance and the mechanism of enhanced heat transfer are numerically simulated for a rectangular passage filled with metal-foams. The results show that when the fluid flows through metal foam,the velocity,temperature and pressure change cyclically. The velocity of the fluid is increasing in the foam metal,and is reduced at the front of the foam skeleton. As the Reynolds number increases,the amplitude of the velocity,the temperature of the fluid and the higher the temperature near the wall of the skeleton increase. When high temperature fluid flows into the foam metal,the temperature first increases slowly,and then drops rapidly after flowing through the foam metal. When the fluid flows through the skeleton,the pressure drop is great and the vortex forms at the back of the frame. As the cell density increases,the heat transfer and the pressure increase. But with the increase of porosity of metal foams,both the heat transfer and the pressure decrease.

关 键 词：多孔介质 流场分析 数值模拟 计算流体动力学 强化传热 流动 

分 类 号：TK124[动力工程及工程热物理—工程热物理]