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Experimental study of heat transfer capacity for loop heat pipe with flat disk evaporator
Applied Thermal Engineering ( IF 6.4 ) Pub Date : 2020-03-09 , DOI: 10.1016/j.applthermaleng.2020.115183
Zikang Zhang , Hao Zhang , Zhenyuan Ma , Zhichun Liu , Wei Liu

Loop heat pipes are passive heat transfer devices which can meet the heat dissipation requirement of high-power electronic devices in aerospace and terrestrial applications. This paper investigates the operating characteristic of a stainless steel-ammonia loop heat pipe with a flat disk evaporator. A biporous wick made from sintered nickel powders was used to produce the capillary force. The heat transfer distance was 1.6 m and the allowable heater surface temperature was below 70 °C. Tests demonstrated that the loop could operate under a heat load ranging from 2.5 W to 180 W (heat flux 0.15-10.8 W/cm2) at heat sink temperature of -10 °C. In addition, variable conductance mode and constant conductance mode existed, and no obvious temperature overshoot or pulsation was observed. The evaporator inlet temperature went through a staged decline due to the effect of initial driving force of vapor expansion during the start-up process. Meanwhile, under the synergy of heat leaks from heater surface and long transport line, whether the vapor phase would form inside the compensation chamber could result in a large discrepancy in temperature trends. The minimum evaporator thermal resistance was 0.096 °C/W at heat sink temperature of -10 °C and the minimum LHP thermal resistance was 0.252 °C/W at heat sink temperature of 10 °C.



中文翻译:

平板式蒸发器回路热管传热能力的实验研究

回路热管是无源传热设备,可以满足航天和地面应用中大功率电子设备的散热要求。本文研究了带平板蒸发器的不锈钢氨循环热管的工作特性。由烧结镍粉制成的双孔灯芯用于产生毛细作用力。传热距离为1.6 m,允许的加热器表面温度低于70°C。测试表明,该回路可以在2.5 W至180 W(热通量0.15-10.8 W / cm 2)在-10°C的散热器温度下。另外,存在可变电导模式和恒定电导模式,并且没有观察到明显的温度过冲或脉动。由于在启动过程中蒸汽膨胀的初始驱动力的作用,蒸发器入口温度经历了阶段性下降。同时,在加热器表面和长传输线的热泄漏协同作用下,补偿室内部是否会形成汽相会导致温度趋势出现较大差异。散热器温度为-10°C时,最小蒸发器热阻为0.096°C / W,散热器温度为10°C时,最小LHP热阻为0.252°C / W。

更新日期:2020-03-09
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