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Heat Pipe Science and Technology, An International Journal

ISSN Print: 2151-7975
ISSN Online: 2151-7991

Archives: Volume 1, 2010 to Volume 8, 2017

Heat Pipe Science and Technology, An International Journal

DOI: 10.1615/HeatPipeScieTech.2013006554
pages 203-222

THE INFLUENCE OF GROOVE SHAPE ON LOOP HEAT PIPE PERFORMANCE

Masakazu Kuroi
Department of Aerospace Engineering, Nagoya University, Furo-cho Chikusa-ku Nagoya, Aichi 464-8603 Japan
Hosei Nagano
Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan

ABSTRACT

The influence of groove shape on loop heat pipe (LHP) performance has been investigated by calculation and experiment. In the calculation, the effects of the width, depth, and the number of axial grooves on steady-state performance were examined. Calculation results indicated the existence of optimum width and depth to lower the evaporator temperature. The reduction of the width and depth advances the growth of the pressure loss through the grooves. By contrast, the expansion of the width and depth advances the reduction of contact area between the evaporator casing and the wick, and the increase of the heat leak from the grooves to the core. Experimental investigations were conducted with a LHP, which is able to exchange wicks. Polytetrafluoroethylene (PTFE) wicks were fabricated as the parameters of the number of axial grooves and the existence or nonexistence of circumferential grooves. The experimental results showed that there is the optimum number of axial grooves. The circumferential grooves lower the evaporator temperature with a small heat input and the distribution of the evaporator temperature by their thermal uniformity effect. However, with a large heat input, the operating temperature of the wick whose grooves are only in the axial direction is the lowest. About start-up time, the larger the axial groove passage area becomes, the shorter the start-up time becomes.


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