19.6μm微管内部阻力特征  

Resistance Characteristics of 19. 6 μm Microtube

作　　者：刘志刚[1] 张荣光[2] 梁世强[3] 贺建坤[1] 

机构地区：[1]山东省科学院能源研究所,山东济南250014 [2]华北科技学院环境与能源工程系,河北三河0652012 [3]中国科学院工程热物理研究所,北京100190

出　　处：《四川大学学报（工程科学版）》2010年第2期199-203,共5页Journal of Sichuan University (Engineering Science Edition)

基　　金：国家自然科学基金资助项目(50976062)

摘　　要：分别以蒸馏水、四氯化碳为工质,流过内径19.6!m光滑石英管,分别采用"单管法"和"双管法"测量微管进出口压力、温度和流量,实验得到了雷诺数(Re数)在9.6～530之间的微管内部流动阻力,并与经典理论值进行了对比。实验研究结果表明,粘性耗散效应降低了摩擦系数,降低了约13.7%;进出口压力降、入口效应与双电层效应(electrical double layer,EDL效应)则增加微管内部摩擦系数,在Re数相同时,其中,进出口压力降与入口效应大约增加了16.12%摩擦系数,EDL效应增加了约6.84%摩擦系数。忽略3种微尺度效应,19.6!m管流动摩擦系数与Hagen Poiseuille理论值几乎一致。Distilled water and tetrachloromethane,used as the working fluid,flowed through the smooth quartz glass microtube with inner diameter of 19.60μm.The single-tube and double-tube methods were used to measure the pressures and temperatures of the inlet and outlet of microtube.The flow rates and flow resistances in microtube were obtained when the Reynolds number varied from 9.6 to 530 and were compared with the classical theoretical values.The investigation showed that the viscous dissipation decreased the friction factor by about 13.7% .However,the pressure drop of the inlet and outlet of microtube,the entrance effect and the electrical double layer effect （EDL effect） increased the friction factor by 16.12% and 6.84%,repectively.Moreover,the friction factor was approximately equal to those predicted by the Hagen-Poiseuille in 19.6μm if neglecting those microscale effects.

关 键 词：微石英管 摩擦系数 粘性耗散 入口效应 双电层效应 

分 类 号：TK124[动力工程及工程热物理—工程热物理]