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Heat Transfer Research
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ISSN 印刷: 1064-2285
ISSN オンライン: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.v40.i4.40
pages 321-332

Temperature Oscillation of mLHP with Flat Evaporator

Dongxing Gai
School of Energy and Power Engineering, Wuhan Institute of Technology, 430205, China
Wei Liu
School of Energy and Power Engineering, Huazhong University of Science & Tecnology, 1037 Luo Yu Rd. Hongshan District, Wuhan 430074, China
Zhichun Liu
School of Energy and Power Engineering, Huazhong University of Science & Tecnology, 1037 Luo Yu Rd. Hongshan District, Wuhan 430074, China
Jinguo Yang
Huazhong University of Science and Technology (HUST), 1037 Luoyu Rd., Hongshan District, Wuhan 430074, China

要約

Loop heat pipes (LHPs) are heat transfer devices whose operating principle is based on evaporation and condensation of a working fluid, and which use the capillary pumping forces to ensure fluid circulation. Temperature oscillations are a rather wide-spread phenomenon accompanying the operation of miniature loop heat pipes (mLHP), which depends on the charging ratio of the working fluid, the device orientation in the gravity field, and the conditions of the condenser cooling, and so on. Intense oscillation, whose amplitude may exceed tens of centigrade degrees and the period may be equal to tens of minutes, arises from the lack of a working fluid in a mLHP when a hot condensate or vapor bubbles periodically penetrate into the compensation chamber and act on the vapor phase in it, thus increasing its temperature and volume. Changes in the external conditions, for instance, the LHP arrangement in an unfavorable orientation or applied heat load with respect to the conditions for which the filling volume is optimal, also contribute to initiation of intense temperature oscillation. All in all, the heat leak from the evaporator to the compensation chamber, the heat loss to the ambient, and the temperature and rate of subcooled liquid dictate the vapor bubble condition inside the compensation chamber, and the rate of the vapor bubble growth or dissipation inside the compensation chamber dictates the nature of temperature oscillation. The effects of different liquid charging ratios and the tilt angles to the temperature oscillation are studied in detail.


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