水/乙醇混合工质在硅基微通道中的流动与换热  

Flow and heat transfer of water/ethanol binary mixtures in silicon microchannels

作　　者：魏珍[1] 吴慧英[1] 吴信宇[1] 

机构地区：[1]上海交通大学机械与动力工程学院,上海200240

出　　处：《化工学报》2008年第11期2706-2712,共7页CIESC Journal

基　　金：教育部新世纪优秀人才支持计划项目(NCET-06-0406);上海市教委科研创新项目(08ZZ10)~~

摘　　要：以不同浓度的乙醇水溶液为工质,在5种不同几何尺寸的梯形硅基微通道中进行了层流流动与换热的实验研究。基于实验结果,分别得出了摩擦常数和平均Nusselt数的实验关联式。实验发现微通道的几何尺寸对微流体的流动与换热特性有着非常显著的影响,各通道中的换热随乙醇溶液浓度的变化而呈现不同的特性,而流动特性则不随溶液浓度的变化而变化。同时还发现在本实验参数范围内,入口段效应对流动与换热的影响都十分显著。Experiments were carried out to investigate the flow and heat transfer characteristics of water/ethanol mixtures through five kinds of silicon microchannels with different geometrical parameters.The experimental correlations of flow friction and heat transfer were obtained.The effect of the geometrical parameters on the flow and heat transfer characteristics in silicon microchannels was remarkable.The friction factors of water/ethanol mixtures were the same as those of pure water,but the Nusselt numbers were different.It was also found that the entrance effect was notable for both flow and heat transfer in microchannels.

关 键 词：硅微通道 混合工质 流动特性 对流换热 入口效应 

分 类 号：TK124[动力工程及工程热物理—工程热物理]