Abstract:

Using de-ionized water as working fluid，experiments were conducted to study the forced convective flow and heat transfer characteristics in ultra-light porous copper foam embedded in a copper channel.Through the analysis of experimental parameters，the effects of heat flux，pore density of the metal foam and mass flux on pressure drop，wall temperature and heat transfer coefficient were obtained during the laminar flow range.It was found that the metal foam could enhance the heat transfer and lower the wall temperature dramatically.The heat transfer capability increased with the increase of the Reynolds number.Compared with the common copper channel without the embedment of metal foam，the maximum Nusselt number during convective flow through the copper channel embedded with the metal foam was thirteen times larger，but the pressure drop was obviously increased.The increase of the Reynolds number and the pore density of metal foam also led to lager pressure drop.

Key words: 金属泡沫, 强制对流, 流动阻力, 换热特性

摘要：

以去离子水为冷却液，对其在超轻多孔铜泡沫中的流动和换热特性进行了实验研究。在测定和分析流量、压力降和温度等实验参数的基础上，获取了热流密度、金属泡沫孔密度、液体流量等参数对层流流体流过金属泡沫时的压力降、通道壁面温度、对流换热等特性的影响。结果表明金属泡沫会显著强化对流换热，大大降低通道的壁面温度，其对流换热能力会随Reynolds数的增大而逐渐增强，最大Nusselt数可达空矩形通道的13倍，但与空通道相比，金属泡沫通道的压力降显著增大，并随Reynolds数及金属泡沫孔密度的增大而增大。

关键词: 金属泡沫, 强制对流, 流动阻力, 换热特性