泵驱两相冷却系统设计及性能验证

Design and Performance Verification of Pump-driven Two-phase Cooling System

为了解决电子设备中高热流密度器件的散热问题,文中利用介质相变原理,采用泵驱两相冷却技术实现高效散热。搭建了泵驱两相冷却系统并对关键部件的设计进行了研究,验证分析了系统的散热性能及热负荷变化对多支路流量分配的影响。结果表明:以R134a为工作介质的泵驱两相冷却系统可实现312 W/cm^(2)的局部散热热流密度;对于多点热源(热流密度为0.4~5.5 W/cm^(2)),不同热源与冷板贴合面附近的温度均匀性好,温差小于1℃;对于多支路系统,某一支路热负荷的变化会引起各支路流量分配的变化。

To solve the heat dissipation problem of high heat flux devices in electronic equipment,the pumpdriven two-phase cooling technology,which is based on the principle of medium phase transformation,is adopted.In this paper the pump-driven two-phase cooling system is built and the key components are designed.The heat dissipation performance of the system and the influence of heat load change on multi-branch flow distribution are analyzed.The results show that the 312 W/cm^(2) local heat flux of the pump-driven two-phase cooling system with R134 a as working medium can be achieved,the temperatures near the joint surfaces of different heat sources and cold plate are uniform,and the temperature difference is less than 1℃for multipoint heat sources(heat flux of 0.4~5.5 W/cm^(2)),the heat load changes of a branch can cause the flow distribution changes of each branch for multi-branch system.