NDLI: Gravity Effects on the Performance of a Flat Loop Heat Pipe

Content Provider	Springer Nature Link
Author	Mo, Dong Chuan Ding, Nan Lu, Shu Shen
Copyright Year	2009
Abstract	A loop heat pipe with flat evaporator (FLHP) is manufactured from copper, and filled with ultrapure water as the working fluid. The heat transfer characteristics have been studied experimentally. The gravity impacts the heat transfer characteristics of the FLHP in different orientations. Operation of the FLHP at orientations against the gravity which is the evaporator above the condenser leads to the higher temperature of the evaporator and the lower loop heat tranfer performance. At horizontal orientation with the evaporator above the compensation chamber (CC), the working fluid is difficult to reach the wick and has the highest temperature. With the increasing of the heat load upto more than 300 W, the loop thermal resistance decreases and approaches a minimum value of about 0.2 K/W at the vertical orientation helped by gravity. Experimental results show that the start-up with low power needs a temperature overshoot. Oscillations with high frequency (with periods on the order of seconds to minutes) and high amplitude (with temperature changes on the order of tens degree Kelvin) are observed. A model is developed, which shows the working fluid distributing in the evaporator wick may result such oscillations. In most cases, the highest amplitude in the loop is observed in the liquid line near CC, and the lowest amplitude is in the CC.
Starting Page	95
Ending Page	102
Page Count	8
File Format	PDF
ISSN	09380108
Journal	Microgravity Science and Technology
Volume Number	21
Issue Number	1
e-ISSN	18750494
Language	English
Publisher	Springer Netherlands
Publisher Date	2009-07-09
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Flat loop heat pipe Gravity effects Start up Oscillation Mechanics, Fluids, Thermodynamics Extraterrestrial Physics, Space Sciences Aerospace Technology and Astronautics
Content Type	Text
Resource Type	Article
Subject	Applied Mathematics Physics and Astronomy Engineering Modeling and Simulation

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