泵驱两相回路中的小通道蒸发器传热特性试验研究  

Experimental Study on Heat Transfer Characteristics of Minichannel Evaporator in Mechanically Pumped Two-Phase Loop

作　　者：赵陶程 郑毅[1] 王贺[1] 张程宾[1] Zhao Taocheng;Zheng Yi;Wang He;Zhang Chengbin(Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education,Southeast University,Nanjing 210096,China)

机构地区：[1]东南大学能源热转换及其过程测控教育部重点实验室,江苏南京210096

出　　处：《航空科学技术》2022年第8期95-102,共8页Aeronautical Science & Technology

基　　金：航空科学基金(2020Z028069003)。

摘　　要：基于高速摄像装置研究了泵驱两相回路矩形截面平行小通道蒸发器沸腾传热特性,重点关注了工质流量的影响机理。分析讨论了不同热负荷和不同流量工况下的温度、压力动态响应曲线和流型特征。研究结果表明,小通道蒸发器内流动沸腾传热过程随工质流量由高到低依序经历全域稳定传热阶段、局部传热弱化阶段、全域传热恶化阶段,相应阶段的通道内工质压力变化具有稳定脉动、小幅脉动、大幅脉动的特征。可视化分析发现反环状流是出现局部传热弱化的标志。随着质量流量的减少,反环状流的发生起始点从下游逐渐向上游移动。研究工作揭示了小通道蒸发器沸腾传热的热动力学特性,对小通道蒸发器在机载电子散热设备上的应用奠定一定基础。The flow boiling heat transfer characteristics of the minichannel evaporator in a mechanically pumped twophase loop are studied based on the visualization of high-speed camera device,and the effect mechanism of flow rate is specifically focused.The dynamic response of temperature and pressure as well as the characteristics of flow pattern under different heat flux and different flow conditions are evaluated and discussed.The experimental results indicate that,with the mass flow rate from high to low,the flow boiling heat transfer process in the minichannel evaporator can be divided into the global stable heat transfer stage,the local heat weakening stage and the global heat transfer deterioration stage in order.Correspondingly,the pressure change shows the characteristics of stable pulsation,small pulsation and large pulsation.Visualization analysis demonstrated that anti-annular flow is the sign of local heat transfer weakening.With the decrease of heat flux,the starting point of anti-annular flow moves from the downstream to the upstream.This work provides a further insight into the thermal dynamics of boiling heat transfer in minichannel evaporator,which provides the data support for the application of the minichannel evaporator in the airborne electronic cooling equipment.

关 键 词：小通道 流动沸腾 机载电子设备 传热 流型 

分 类 号：V443[航空宇航科学与技术—飞行器设计]