高频剧烈负荷冲击对微槽群结构热沉内流动换热特性的影响机理

项目名称： 高频剧烈负荷冲击对微槽群结构热沉内流动换热特性的影响机理

项目编号： No.51476167

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 能源与动力工程

项目作者： 王涛

作者单位： 中国科学院工程热物理研究所

项目金额： 80万元

中文摘要： 基于已研发出的特高压直流输电系统中大功率陶瓷电阻本体与取热器一体化的集成冷却系统，本项目针对其中出现的高频剧烈热负荷冲击条件下，微槽群结构热沉内工质流动换热的不稳定特性进行系统深入的研究。综合利用Micro-PIV 粒子图像测速技术、超高速显微摄像仪、高精度红外热像仪、高频数据采集系统，实现对微细尺度结构热沉内工质的三维空间分布、流场、温度场及微汽泡动力学行为的同步测量，建立高频剧烈负荷波动和微尺度效应共同作用条件下，微槽群内工质的三维流动、润湿、干涸、微汽泡动力学行为的理论模型，阐明温度场、近壁应力场、毛细力场作用下三相接触线附近薄液膜区域内的薄液膜高强度蒸发和厚液膜区域内的液体核态沸腾的复合相变强化换热及发生临界热负荷的具体机理，发展和丰富多物理场耦合条件下的微细尺度强化换热研究理论，为大功率电力电子器件先进热管理系统的设计提供理论依据和优化方法。

中文关键词： 负荷冲击；微细尺度结构热沉；流动润湿特性；微汽泡动力学；复合相变

英文摘要： A high power resistor and heat sink integrated in the cooling system has been developed which is used in ultra HVDC transmission system.The project studies the instability characteristics of the working fluid in the microgroove heat sink under the condition of high frequency and acute heat load impact.The experimental technology such as Micro-PIV particle image technology, high speed micro-photography, high precision infrared thermal imager and high speed data acquisition system are comprehensively used to synchronously measure the three dimensional distributions of working fluid, flow field, temperature field and the characteristic of the micro-bubble dynamics. The three dimensional flow, wetting, drying up and micro-bubble dynamics of the working fluid is theoretically studied by considering the high frequency and acute heat load impact as well as microscale effect. The mechanism of critical heat flux and high strength compound phase change heat transfer is illuminated in the thin liquid film evaporation of thin liquid film area near three phase contact line and nucleate boiling of thick liquid area.The microscale heat transfer theory under the condition of the multiphysics field will be developed and enriched. The design principle and optimization method would be acquired for the high power electronic devices cooling system.

英文关键词： heat load impact;microscale heat sink;flow and wetting characteristics;micro-bubble dynamics;compound phase change