细小圆管内液体流动特性实验研究  

EXPERIMENTAL INVESTIGATION OF FLOW CHARACTERISTICS OF LIQUID IN MINI-TUBES

作　　者：鲁进利[1] 王燕[1] 许忠林[1] 王淑娟[1] 郝英立[1] 

机构地区：[1]东南大学能源与环境学院,江苏南京210096

出　　处：《工程热物理学报》2009年第12期2077-2080,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.50676020);国家重点基础研究发展计划(973计划)资助项目(No.2006CB300404);教育部留学回国人员科研启动基金资助项目(No.6803001005);东南大学科学基金资助项目(No.9203007013;No.9203001337)

摘　　要：本文实验研究了去离子水在直径为1.0～2.0 mm的细小圆管中的流动阻力特性。通过比较相同直径、不同管长的压差,获得了摩擦因子及局部损失系数随Re数变化关系。本文实验条件下,对于不同直径的细小圆管,沿程压降及局部压降随流速变化趋势一致;随着管径减小,摩擦因子也减小,且在层流区和湍流区内均要比常规尺度条件下的小;对于不同直径的细小圆管,局部损失系数随Re数变化趋势基本一致,当Re数相同时,管径越小,对应的局部损失系数越大;对于直径为1.0～2.0 mm的细小圆管,临界雷诺数Re_c=2050～2300。The resistance characteristics of deionized water in minitubes with three different diameters ranging from 1.0 mm to 2.0 mm are experimentally investigated. The relation of friction factor and minor loss coefficient with Reynolds number are obtained. The results show that the variations of pressure drop and local pressure drop with mean velocity of fluid in minitubes are consistent basically. The friction factor decreases with the decrease of diameter. And the values are smaller than that in convectional scale in laminar flow region and turbulence flow region. The variations of minor loss coefficient with Reynolds number in the minitubes are consistent basically. The minor loss coefficient increases with the decrease of diameter under the condition of same Reynolds number. The criti- cal Reynolds number is 2050-2300 in the minitubes with the diameter ranging from 1.0 mm to 2.0 mm.

关 键 词：流动特性 摩擦因子 局部损失 

分 类 号：TK124[动力工程及工程热物理—工程热物理]