19.6μm内径的微石英管内部流动与传热的实验研究  

An Experimental Study of Flow and Heat Transfer in a 19.6μm Inner Diameter Quartz Microtube

作　　者：管宁[1] 张承武[1] 刘志刚[1] 

机构地区：[1]山东省科学院能源研究所,济南250014

出　　处：《山东科学》2009年第5期44-47,共4页Shandong Science

基　　金：中国高技术研究发展计划(国家863计划)项目(2007AA05Z259);山东省自然科学基金项目(Y2007F78)

摘　　要：采用实验方法研究了去离子超纯水流过内径为19.6μm的微管过程中的流动与换热特性。通过测量蒸汽加热的微管进出口的压降以及温度,得到了微管内去离子水流动的摩擦系数和Nu数,并对结果进行了分析。研究结果表明,在粘性耗散效应以及双电层效应的综合影响下微管内的摩擦系数要高于Hagen-Poiseulle理论值;而由于受流体热物性变化以及共轭传热的影响,当Re数小于400时实验测得的Nu数要低于经典层流管流的理论值。We perform an experimental study for flow and heat transfer characteristics of the deionizcd water that flows through a 19.6μm inner microtube. We measure pressure decrease and temperature difference between the inlet and outlet of the microtube. We therefore drive the friction coefficient and the Nusseh number of the water and analyze the results. These results indicate that the friction coefficient in the microtube is larger than the theoretical values of Hagen-Poiseulle under the influences of viscous dissipation effect and electric double-layer effect, while the e Nusseh number is less than the classical theoretical laminar value under the influences xperimental of variable fluid thermal properties and conjugate heat transfer when the Reynolds number is less than 400.

关 键 词：微管 摩擦系数 Nu数 

分 类 号：TK124[动力工程及工程热物理—工程热物理]