不同截面微通道中流动阻力特性  

Flow characteristics in microchannel with different cross-section

作　　者：鲁进利[1] 周宾[2] 许忠林[3] 蒋洁[1] 郭雨含[1] 郝英立[1,2] 

机构地区：[1]东南大学能源与环境学院,南京210096 [2]东南大学空间科学与技术研究院,南京210096 [3]上海卫星工程研究所,上海200240

出　　处：《东南大学学报（自然科学版）》2011年第3期554-557,共4页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(50676020;50906013);国家重点基础研究发展计划(973计划)资助项目(2006CB300404);教育部新教师基金资助项目(20090092120064)

摘　　要：实验研究了微通道内去离子水的流动阻力特性,微通道当量直径范围De=0.210～1.069mm,雷诺数范围Re=102～104,截面形状分为矩形、半圆形及三角形.通过测量微通道沿程压降及出、入口局部压降随流量变化关系,获得了沿程阻力系数及局部阻力系数.结果表明:当截面形状相同时,摩擦阻力系数随着当量直径的减小而降低;当量直径接近,截面形状不同时,其摩擦阻力系数也不相同;进、出口局部阻力系数变化趋势一致,且入口局部阻力系数要比出口的大;流型发生转变的临界雷诺数Rec=600～1 000.The flow characteristics of deionized water in microchannels investigated experimentally.The hydraulic diameter of microchannels range from 0.210 to 1.069 mm,and the Reynolds number range from 102 to 104.The cross-section is comprised of rectangular,semicircular and triangular.The pressure drop along microchannel and local pressure drop at inlet and outlet are measured and the friction factor and local resistance coefficient are obtained.Results show that the friction factor decreases with decreasing hydraulic diameter under the same cross-section geometry.The friction factor is also different with cross-section geometry even if the hydraulic diameter is similar.The variation trend of local friction factor at inlet and outlet are consistent in microchannels,but the values of friction factor at inlet are bigger than at outlet.The result also shows that the critical Reynolds number of flow pattern transition range from 600 to 1 000.

关 键 词：微通道 摩擦系数 局部损失 流动特性 截面形状 

分 类 号：TQ336.3[化学工程—橡胶工业]