摘要
为了深入研究重力热管的传热特性,设计并搭建了重力热管系统试验台,以去离子水为工质,在不同输入功率Q和充液率FR下对热管外壁温度进行了试验。根据外壁温度数据,分析了该热管的等温性,计算了等效对流传热系数,并以此评价其传热性能。研究结果表明,充液率在35%~40%范围内,等效对流传热系数随输入功率的增加而减小;充液率在50%~70%范围内持续增加时,等效对流传热系数先缓慢增加,当超过一定值后又缓慢减小,且输入功率为40 W时,等效对流传热系数较高,热管有较好的传热性能;反之,当输入功率为定值时,热管等效对流传热系数的变化与充液率的变化相一致,即先跳跃式提升,达到最高值后缓慢下降;此外,在输入功率为40 W、充液率为50%的工况下,存在最高等效对流传热系数为3 190.782 W·m-2·K-1,即认为重力热管在此时传热性能最佳。
An experimental platform of the gravity heat pipe system was designed and built,in order to deeply study the heat transfer characteristics of gravity heat pipe.Using deionized water as the working medium,the temperature of the outer wall of the heat pipe was tested at different input power Qand liquid filling rate FR.According to the outer wall temperature data,the average temperature performance of the heat pipe is analyzed;the equivalent convective heat transfer coefficient is calculated to evaluate its heat transfer performance.The results show that the equivalent convective heat transfer coefficient decreases with the increase of input power when the filling rate is within 35%-40%;and it slowly increases when the filling rate continues to increase from 50%to 70%.When it exceeds a certain value,it slowly decreases after a period of stabilization.And when the input power is 40 W,the equivalent convection heat transfer coefficient is higher,and the heat pipe has better heat transfer performance.Conversely,when the input power is constant,equivalent convective heat transfer coefficient of the heat pipe is consistent with the change of the liquid filling rate,the first skip lift,after reaching the highest value,slowly decline.In addition,at the input power of 40 W,liquid filling rate at 50%,there is the highest equivalent convection heat transfer coefficient of 3 190.782 W·m-2·K-1,that is gravity heat pipe at this time the best heat transfer performance.
作者
张云峰
夏寻
刘昱
李涛
周洋
ZHANG Yun-feng;XIA Xun;LIU Y u;LI Tao;ZHOU Yang(School of Energy and Power Engineering,Changsha University of Science and Technology,Changsha 410114,China)
出处
《长沙理工大学学报（自然科学版）》
CAS
2018年第2期94-100,共7页
Journal of Changsha University of Science and Technology:Natural Science
基金
湖南省科技厅科研项目(2011GK3901)
长沙理工大学研究生科研创新项目(CX2016SS10)
关键词
重力热管
传热性能
输入功率
充液率
等效对流传热系数
gravity heat pipe
heat transfer performance
input power
liquid filling rate
equivalent convective heat transfer coefficient
