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Journal of Enhanced Heat Transfer
IF: 0.562 5-Year IF: 0.605 SJR: 0.175 SNIP: 0.361 CiteScore™: 0.33

ISSN Print: 1065-5131
ISSN Online: 1026-5511

Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.v11.i4.240
pages 467-476

Experimental Investigation of Flat Miniature Heat Pipes with Three Kinds of Micro Grooves

Chunli Fan
Faculty 307, Naval University of Engineering, Wuhan, 430033, P.R. China
Fengrui Sun
College of Power Engineering, Naval University of Engineering, Wuhan 430033, People’s Republic of China
Li Yang
College of Power Engineering, Naval University of Engineering, Wuhan 430033, People’s Republic of China
Lingen Chen
Institute of Thermal Science and Power Engineering, Naval University of Engineering, Wuhan, 430033, P. R. China; Military Key Laboratory for Naval Ship Power Engineering, Naval University of Engineering, Wuhan, 430033, P. R. China; College of Power Engineering, Naval University of Engineering, Wuhan 430033, P. R. China
Wei Qu
China Academy of Aerospace Aerodynamics (CAAA), P.O. Box 7201-16, Beijing, 100074, China
Tongze Ma
Institute of Engineering Thermophysics, Chinese Academy of Sciences, P.O. Box 2706, Beijing, 100080, P.R. China

ABSTRACT

The flat miniature heat pipes (FMHPs) with three kinds of micro grooves, including two kinds of deep rectangular grooves and one kind of zigzag groove, are fabricated employing the electric-discharging machining wire cutting method. In order to study systematically the influence of gravitation on the performance of the heat pipes, axial grooves are distributed on only one side of the interior perimeter of the FMHPs. The heat pipes with different charging ratios and working fluids are tested under different tilt angles, so as to study the influence of factors such as the gravitation, charging ratio, groove structure, etc., on the performance of the FMHPs. Experimental results concluded that the influence of the gravitation on the performance of the FMHPs is obvious in the axial direction, while in the radial direction the influence is obvious only if the charging ratio is larger. The optimal charging ratio of the FMHPs with deep grooves is 2.3, and the FMHPs with deep grooves have excellent heat transfer performance.


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