微尺度气体流动特性实验研究  

EXPERIMENTAL STUDY ON GAS FLOW CHARACTERISTICS IN MICROCHANNELSS

作　　者：张田田[1] 贾力[1] 李成文[1] 

机构地区：[1]北京交通大学机械与电子控制工程学院,北京100044

出　　处：《工程热物理学报》2009年第5期854-856,共3页Journal of Engineering Thermophysics

基　　金：国家自然科学基金(No 50776006);教育部项目(No.107113);"863"计划项目(No.2006AA05Z228);北京交通大学优秀博士生创新基金项目(No.48013)资助

摘　　要：现有关于微尺度下气体流动特性的文献结果差异很大,甚至互相矛盾。文中提出入口效应以及充分发展段的流动特性与常规尺度的差异可能是影响微尺度下气体流动特性的关键因素。搭建了单相气体流动特性实验研究系统,针对这一影响因素对气体流动特性的影响规律进行了系统分析,证实了上述结论,发现微尺度下充分发展段流体的摩擦阻力明显小于常规理论预测值。针对微尺度下气体流动特性进行了系统分析。Current results on gas flow in microchannel in available literatures are different or even contradictory. In the paper, it is proposed that entrance effect is a key contributor that causes these different or contradictory in microscale. The related experimental system is established. The entrance effect on the flow characteristics in microchannels is studied in details. It is validated that entrance effect contributes the contradictory of available results. It is found that the friction constant for fully developed micro flow is obviously smaller than that is predicted by conventional theory. The systematically analysis on gas flow characteristics is given.

关 键 词：微通道 流动特性 入口效应 可压缩性 

分 类 号：TH432.1[机械工程—机械制造及自动化]