盘管表面喷雾冷却传热传质特性实验研究  

Experimental study on heat and mass transfer characteristics of spray cooling on coil surface

作　　者：胡开永[1] 陈昭毅 程建路 胡芸清 郑晨潇[1] 申江[1] Hu Kaiyong;Chen Zhaoyi;Cheng Jianlu;Hu Yunqing;Zheng Chenxiao;Shen Jiang(Tianjin Key Lab of Refrigeration Technology,Tianjin University of Commerce,Tianjin 300134,China;Hua Shang International Engineering Co.Ltd.,Beijing 100069,China)

机构地区：[1]天津商业大学天津市制冷技术重点实验室,天津300134 [2]华商国际工程有限公司,北京100069

出　　处：《低温与超导》2023年第9期91-96,共6页Cryogenics and Superconductivity

基　　金：天津市研究生科研创新项目(2022SKYZ058);天津市教委科研计划项目(2022KJ003)资助。

摘　　要：针对盘管表面喷雾冷却,通过实验方法研究迎面风速、喷嘴进水流量及辅助空气压力对系统传热传质的影响。研究表明,随着迎面风速的增加,系统的传热传质系数逐渐增大,当风速达到1.5 m/s时,部分液滴未能与盘管进行换热就被排出系统,使有效液滴数量降低,传质系数增长速度减慢;随着喷嘴进口水流量的增加,系统的传热传质系数增加,但流量过大会在盘管表明生成较厚液膜形成热阻,使传热传质能力下降;随着辅助空气压力的增大,系统传热传质系数增大,但进水流量一定时,压力过大会使得喷雾流量下降,传热传质增长速率下降。The impacts of head-on wind speed,nozzle inlet flow rate,and auxiliary air pressure on the heat and mass transfer characteristics of a coil surface spray cooling system were studied using experimental methods.The results indicate a posi⁃tive correlation between the head-on wind speed and the heat and mass transfer coefficient of the system.When the wind speed reaches 1.5 m/s,certain droplets are expelled from the system and are unable to undergo heat exchange with the coil.As a re⁃sult,the effective number of droplets decreases and the rate of expansion of the mass transfer coefficient slows down.The heat and mass transfer coefficient of the system improves as the water flow at the entrance of the nozzle increases,but excessive flow gener⁃ates a thicker liquid coating on the surface of the coil to form a thermal resistance,limiting the heat and mass transmission capaci⁃ty.The coefficient of heat and mass transfer in the system has a positive correlation with the auxiliary air pressure.However,be⁃yond a particular inlet flow rate,high pressure leads to a decrease in the spray flow rate and consequently hinders the rate of heat and mass transfer.

关 键 词：喷雾冷却 迎面风速 喷嘴流量 辅助空气压力 

分 类 号：TK124[动力工程及工程热物理—工程热物理]