Abstract

Three micro heat pipes belonging to different types are selected as the research objects due to their lowest thermal resistance and the steadiest operation according to published literatures. They are the pulsating heat pipe with corrugated configuration (CPHP), the flat-plate heat pipe with eight microchannels (FPMHP) and the radial pulsating heat pipe (RPHP). A mathematical model common to the three micro heat pipes is built, and the maximum deviation between simulation and actual results is 16.1%. It is found that CPHP has the best heat transfer performance with the minimum thermal resistance of 1.14 K·W⁻¹. Its average wall temperature and center-line velocity regularly oscillate after the startup point. There is a pause phenomenon of motion for CPHP, and the pause period of motion decreases from 8.93 s to 7.25 s with the increasing input heat flux. RPHP possesses the most excellent temperature uniformity with the maximum axial temperature difference of 5.24 K. Furthermore, FPMHP is suitable for cooling temperature-resistant devices because its average wall temperature of evaporation section is the highest.

摘要

根据已发表的文献，选择了属于不同类型的三种微型热管作为研究对象，因为它们的热阻最低，运行最稳定。它们是波纹状脉动热管（CPHP）、八微通道平板热管（FPMHP）和径向脉动热管（RPHP）。建立了三种微热管通用的数学模型，仿真结果与实际结果的最大偏差为16.1%。发现CPHP具有最好的传热性能，最小热阻为1.14 K·W ^-1. 其平均壁温和中心线速度在启动点之后有规律地振荡。CPHP存在运动暂停现象，随着输入热通量的增加，运动暂停时间从8.93 s减少到7.25 s。RPHP具有最优异的温度均匀性，最大轴向温差为5.24 K。此外，FPMHP的蒸发段平均壁温最高，适用于耐温装置的冷却。