摘要
为完善毛细管基础理论研究，本文利用水银压差计、电子天平等元件建立实验系统，通过实验的方法对内径为2．3ram的毛细管的摩擦阻力系数变化规律、层流区和紊流光滑区的摩擦阻力系数进行了测定。其中，摩擦阻力系数测定中Re范围为400--7500，管内流体流速范围为0．2-3．2m／s。结果表明，毛细管内流动状态从层流向湍流转捩的临界雷诺数为2100-2300，毛细管内的流动阻力特性与典型的常规管径的管道流动特性吻合良好，并得到常规的理论完全适用于毛细管的结论。
This manuscript investigates the friction characteristics and the effective diameters of a capillary tube. Critical Reynolds number and resistance characteristic during the transformation from laminar flow to turbulence of capillary single tube was investigated by experiment to propose the transition critical Reynolds number from laminar flow to turbulence and verify if the flow resistance characteristic of capillary single tube meets typical normal tube. The experiment is carded out on water resistance test board with internal diameter of 2.3 mm capillary tubes. To get the friction characteristics, flow resistance coefficient was tested with Reynolds number varying from 400 up to 7500 and velocity varying in the range from 0.2m/s up to 3.2rn/s. Experiment results show that laminar-to-turbulent transition occurs for Reynolds number in the range 2100-2300 and the friction characteristics is consistent with typical normal circle tubes. It means normal tube friction theory may apply to capillary tubes. Above all, in this paper the transition critical Reynolds number from laminar flow to turbulence of capillary tube is proposed and indicates that the flow resistance characteristic of capillary single tube meets typical normal tube.
出处
《建筑热能通风空调》
2016年第11期13-16,共4页
Building Energy & Environment
基金
江苏省建设厅科技计划项目(2015ZD83)
关键词
毛细管
临界雷诺数
摩擦阻力系数
capillary tube, Laminar-turbulent transition Reynolds number, frictional loss coefficient
