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工质对微石英管内部流动特征的影响
引用本文:张荣光, 李满, 唐海香. 工质对微石英管内部流动特征的影响[J]. 北京工业大学学报, 2007, 33(3): 315-319.
作者姓名:张荣光  李满  唐海香
作者单位:1.华北科技学院 资源与环境工程系, 北京 101601
摘    要:为采用“两管法”以消除进出口压力降及入口效应对流动的影响,分别以蒸馏水、CCl4及N2为工质,测量其流过内径d分别为19.60、44.63、91.65及140.86μm微石英管的流量与进出口压降,得到微管内部充分发展流的摩擦阻力系数fRe的关系.实验结果表明,除d=19.60μm的管外,其他管在Re较小时,微管内部的f值与Hagen-Poiseuille解几乎一致;当Re升高到1300时,f已开始偏离Hagen-Piseuille解.对于d=19.60μm的管,在Re<500,工质为蒸馏水时,f比Hagen-Poiseuille解高10%~15%;工质为CCl4时,f仍然约等于Hagen-Poiseulle解;工质为N2时,f比Hagen-Poiseulle解低8%~10%.

关 键 词:微管  雷诺数  压降  摩擦系数
文章编号:0254-0037(2007)03-0315-05
收稿时间:2006-03-09
修稿时间:2006-03-09

The Influence of Working Fluid on Flow Characteristic in Microtubes
ZHANG Rong-guang, LI Man, TANG Hai-xiang. The Influence of Working Fluid on Flow Characteristic in Microtubes[J]. Journal of Beijing University of Technology, 2007, 33(3): 315-319.
Authors:ZHANG Rong-guang  LI Man  TANG Hai-xiang
Affiliation:1.Department of Resource and Environmental Engineering, North China Institute of Science and Technology, Beijing 101601, China
Abstract:The double-tube method was used to eliminate the influence of the pressure drop of inlet and outlet of microtube and the entrance effect on flow in microtube.Distilled water,tetrachloromethane and nitrogen gas,used as the working fluid,flowed through the quartz glass microtubes with inner diameters 19.60μm, 44.63μm,91.65μm and 140.86μm,respectively.The relation between friction factor and Reynolds num- ber was studied by measuring the pressure drop and the flow rate.The experimental results show that the friction factors in microtubes,except the microtube with inner diameter of 19.60μm,are in rough agreement with those predicted by the Hagen-Poiseuille when Reynolds number is low.The friction factors depart from solution of Hagen-Poiseuille when Reynolds number is higher than 1300.For microtube with inner diameter 19.60μm,the values of the friction factor is 10%~15% higher.8%~10% less than those predicted by the Hagen-Poiseuille for the working fluids of distilled water,tetrachlormethane and nitrogen gas,respectively, when Reynolds number is less than 500.
Keywords:microtube  Reynolds number  pressure drop  friction factor  
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