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Heat Pipe Science and Technology, An International Journal

ISSN Imprimer: 2151-7975
ISSN En ligne: 2151-7991

Archives: Volume 1, 2010 to Volume 8, 2017

Heat Pipe Science and Technology, An International Journal

DOI: 10.1615/HeatPipeScieTech.v5.i1-4.440
pages 393-400

EXPERIMENTAL INVESTIGATION OF CLOSED LOOP PULSATING HEAT PIPE USING AMMONIA FLUID: EFFECT OF INCLINATION

Zhihu Xue
China Academy of Aerospace Aerodynamics (CAAA), P.O. Box 7201-16, Beijing, 100074, China
Minghui Xie
China Academy of Aerospace Aerodynamics (CAAA), Beijing 100074, China
Wei Qu
China Academy of Aerospace Aerodynamics (CAAA), P.O. Box 7201-16, Beijing, 100074, China
Jijun Yu
China Academy of Aerospace Aerodynamics (CAAA), P.O. Box 7201-16, Beijing 100074, China
Wei Li
China Academy of Aerospace Aerodynamics (CAAA), Beijing 100074, China

RÉSUMÉ

In this paper, a novel study on performance of CLPHP using ammonia as working fluid is experimented. The tested CLPHP, consisting of 6 turns, was fully made of quartz glass tubes with 6 mm outer diameter and 2 mm inner diameter. The filling ratio is 50%. Wall temperature fluctuations of several key positions are recorded under a series charge of heat inputs, from 40 W to 280 W by step of 40 W. The visualization investigation is conducted to observe the oscillation and circulation flow in the CLPHP. In order to investigate the effects of inclination angles to thermal performance in the ammonia CLPHP, there are four case tests arranged. The trends of temperature fluctuation and thermal resistance as the input power increases at different inclination angles are highlighted. The results show that it is very easy to start up and circulate for the ammonia CLPHP in the condition of inclining angle. The thermal resistance is low to 0.02 K/W, which indicates the heat can be transferred from heating section to cooling section very quickly. It is found that the thermal resistance decreases as the inclination angle increases. At the horizontal operation, or inclination angle of 0 degree, the ammonia CLPHP can easy to start up at low input power, but is hard to formulate circulation flow. In this case, once the input power is high, the capillary in heating section will be burnout, leading to worse thermal performance with high thermal resistance. The way to solve this problem, is recommended to increase the filling ratio.


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