水平管降膜冷态流动形态及滞后现象实验研究  

Study on cold-flow patterns and hysteresis of falling film on a horizontal tube

作　　者：刘华[1] 张鼎喆 刘硕 王潇 王华山[1] LIU Hua;ZHANG Dingzhe;IU Shuo;WANG Xiao;WANG Huashan(College of Vehicles and Energy,Yanshan University,Qinhuangdao 066004,China)

机构地区：[1]燕山大学车辆与能源学院,河北秦皇岛066004

出　　处：《热科学与技术》2023年第2期135-140,共6页Journal of Thermal Science and Technology

基　　金：河北省自然科学基金青年科学基金资助项目(E2017203025);燕山大学基础研究专项课题资助项目(16LGA013);燕山大学基础创新科研培育资助项目(2021LGQN014)。

摘　　要：以25.00 mm铝黄铜管水平管外降膜流动过程为研究对象,对以水为工质的管间流动形态及管间距对临界雷诺数的影响进行研究,基于观察到的流动形态变化的五个阶段分析了流型转换的滞后现象。计算了泰勒波长理论值并与实验测量值进行对比分析。研究结果表明,流动形态的五个阶段,临界雷诺数随管间距增大而增大,滞后现象存在于各个临界流态转化点中,柱帘-帘阶段滞后区间最大,实验泰勒波长较理论值略低,且在理论值附近波动。The falling film flow onthe horizontal pipe of 25.00 mm aluminum brass tube is taken as the research object,the effects of the flow pattern between the tubes using water as the working medium and the distance between the tubes on the critical Reynolds number are analyzed.Based on the observed five stages of the flow pattern,the hysteresis of the flow pattern transformation is analyzed.The theoretical value of Taylor wavelength is calculated and compared with the experimental measurement value.The results show that the critical Reynolds number increases with the increase of tube spacing and hysteresis exists in each critical flow pattern transformation point.The transitional stage of column-curtain to curtain has the largest lag interval.The experimental Taylor wavelength is slightly lower than the theoretical value,and fluctuates around the theoretical value.

关 键 词：降膜流动 流动形态 滞后现象 泰勒波长 

分 类 号：TK212[动力工程及工程热物理—动力机械及工程]