间歇性大功率相变热沉研究  

Research of intermittent high power phase change heat sink

作　　者：李伟健 白敏丽[1] 吕继组[1] 胡成志[1] LI Weijian;BAI Minli;Lü Jizu;HU Chengzhi(School of Energy and Power,Dalian University of Science and Technology,Dalian 116024,China)

机构地区：[1]大连理工大学能源与动力学院,辽宁大连116024

出　　处：《热科学与技术》2020年第6期537-547,共11页Journal of Thermal Science and Technology

基　　金：国家自然科学基金资助项目(51876027,51806028,51806029,51476019);中央高校基本科研业务费资助项目(DUT19JC09).

摘　　要：针对某300 W大功率间歇式热源,选用质量分数9.0%膨胀石墨-56号石蜡复合材料做相变工质,铝翅片做导热结构,基于FLUENT软件,采用等效比热容数学模型,在安全温度为65.0℃情况下,设计得到能稳定运行3500 s的相变热沉。针对该相变热沉,为验证等效比热容数学模型的可靠性,搭建了相变热沉测试系统,研究了热源功率及相变工质对热沉控温性能的影响。结果表明:等效比热容数学模型有效可靠;相变材料熔点越低,相变热沉温控时间越长;而热源输入功率越高,相变工质熔点的影响将变小。此外,为降低系统内部温差、减少石蜡泄露以及降低加工成本,进一步提出了热管-回转式翅片相变热沉,热管-回转式翅片相变热沉在热源功率为300 W条件下,温控时间高达4300 s,内部温差仅在1.6℃以内。For a 300 W high-power intermittent heat source,9%expanded graphite-56 paraffin composite was used as phase change working medium,and aluminum fins were used as heat-conducting structure.Based on FLUENT software and the equivalent specific heat capacity mathematical model,a phase change heat sink capable of stable operation of 3500 s was designed at a safe temperature of 65.0℃.Furthermore,a phase change heat sink test system was established to verify the reliability of the equivalent specific heat capacity mathematical model.And the effects of heat source power and phase change working fluid on the temperature control performance of the heat sink were studied.The results show that the mathematical model of equivalent specific heat capacity is effective and reliable.The lower the melting point of phase change material,the longer the temperature control time of phase change heat sink.And the higher the input power of heat source,the smaller the influence of melting point of phase change working medium.In addition,in order to reduce the internal temperature difference of the system,the leakage of paraffin and the processing cost,the heat pipe-rotary fin phase change heat sink were further proposed.Under the condition of input power of 300 W,the heat pipe-rotary fin phase change heat sink could work safely for 4300 s,and internal temperature difference was within 1.6℃.

关 键 词：相变热沉 石蜡 膨胀石墨 等效比热容 

分 类 号：TK124[动力工程及工程热物理—工程热物理]