耦合引射器和沸腾池的环路热管传热特性研究  

Heat Transfer Characteristics of Loop Heat Pipe with Injector and Boiling Pool

作　　者：刘蕾 袁博 崔晨乙 杨小平 魏进家[1] LIU Lei;YUAN Bo;CUI Chenyi;YANG Xiaoping;WEI Jinjia(School of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi’an 710049, China)

机构地区：[1]西安交通大学化学工程与技术学院,西安710049

出　　处：《西安交通大学学报》2022年第7期19-26,共8页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金青年项目(52006166)。

摘　　要：为了解决环路热管的热泄漏问题并提高其最大热流密度,本文提出了将引射器和沸腾池耦合于环路热管结构中。引射器由蒸发器产生的蒸汽驱动,抽吸补偿腔内的热液体以移除热泄漏并为沸腾池供液,而加工了柱状微结构强化表面的沸腾池则是实现高热流密度散热的主要部件。首先实验研究了该环路热管在不同热负荷下的变工况运行特性和稳态运行特性;然后根据运行温度以及主要部件的质量和能量守恒计算了环路热管内部的流速分布并定量评估了引射器对移除热泄漏的贡献;最后比较了本装置与传统环路热管的传热性能。结果表明该环路热管具有良好的变工况运行特性,热负荷变化后能快速建立新的稳态。适当增加蒸发器的热负荷有利于提高沸腾池的传热极限。当蒸发器热负荷为200 W时,沸腾池的极限热负荷为550 W,对应的热流密度高达114 W·cm^(-2),高于大多数传统环路热管。此外,得益于热泄漏的及时移除,本环路热管能在热泄漏占比高达28%时稳定运行。这些结果表明该环路热管有望运用于高热流密度和多热源系统的散热。To solve the heat leakage problem of a loop heat pipe and increase the maximum heat flux,an injector and a boiling pool were added to the loop heat pipe.The injector driven by the steam from an evaporator was designed to induce a directional motion of the liquid in the compensation chamber,which can not only remove the heat leakage,but also supply liquid to the boiling pool.The boiling pool with micro-pin-finned surface was used for high heat flux heat dissipation.Firstly,experiments were conducted to study the heat transfer characteristics of the loop heat pipe under varying operating conditions and steady-state operating conditions.Then,the flow velocity distribution in the loop and the amount of heat leakage removed by the injector were calculated based on the operating temperature and the mass and energy conservation of the main components.Finally,the heat transfer performance of this device was compared with that of the conventional loop heat pipes.The results show that the novel loop heat pipe worked well under varying conditions and responded quickly to the change of heat load.Increasing the heat load of the evaporator appropriately could lead to a higher heat transfer limit of the boiling pool.When the heat load of the evaporator was 200 W,the maximum heat load of the boiling pool was 550 W,and the corresponding heat flux was as high as 114 W·cm^(-2),which was higher than that of most conventional loop heat pipes.For the timely removal of heat leakage,the loop heat pipe can operate stably even at a high heat leakage percentage of 28%.These results indicated that the novel loop heat pipe is a potential solution to cool devices with high heat flux and multiple heat sources.

关 键 词：传热 环路热管 引射器 热泄漏 

分 类 号：TK124[动力工程及工程热物理—工程热物理]