ABSTRACT

This paper is focused on the effects of different evacuation pressures on thermal performance of vertically placed flat-plate pulsating heat pipe (FP-PHP). Experimental results show that the difference in the amount of non-condensable gas (NCG) caused by evacuation pressures is an important reason for the difference in thermal performance of FP-PHP. The water FP-PHP under evacuation pressure of 200 Pa with 18.9 wt% NCG requires the least start-up power and time. NCG will increase the operation instability after ethanol FP-PHP has started up. Evacuation pressure has the least effect on HFE-347 FP-PHP, which can start up successfully without any evacuation.

摘要

本文重点研究了不同抽空压力对垂直放置的平板脉动热管 (FP-PHP) 热性能的影响。实验结果表明，抽空压力引起的不凝性气体（NCG）量的差异是导致FP-PHP热工性能差异的重要原因。抽空压力为 200 Pa 且 NCG 为 18.9 wt% 的水 FP-PHP 需要最少的启动功率和时间。NCG 会增加乙醇 FP-PHP 启动后的运行不稳定性。疏散压力对 HFE-347 FP-PHP 的影响最小，无需任何疏散即可成功启动。