Effect of different evacuation pressures on thermal performance of vertically placed flat-plate pulsating heat pipe

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.

KEYWORDS:

• Flat-plate-pulsating heat pipe
• evacuation pressure
• non-condensable gas
• thermal performance

Acknowledgments

The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: The authors acknowledge the financial, support provided by National Natural Science Foundation of China (Grant No. 52076048), the Guangxi Natural Science Foundation (Grant No. 2017JJA160108, 2019JJG160011), Guangxi Colleges and Universities Program of Innovative Research Team and Outstanding Talent, and Innovation Project of GUET Graduate Education (Grant No. 2018JGB192, 2018XWYJ02).

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Funding

This work was supported by the Natural Science Foundation of Guangxi Province [2017JJA160108]; Natural Science Foundation of Guangxi Province [2019JJG160011]; National Natural Science Foundation of China [52076048]; Guangxi Colleges and Universities Program of Innovative Research Team and Outstanding Talent [2018015].