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Heat Pipe Science and Technology, An International Journal

Publication de 4  numéros par an

ISSN Imprimer: 2151-7975

ISSN En ligne: 2151-7991

THE INFLUENCE OF GROOVE SHAPE ON LOOP HEAT PIPE PERFORMANCE

Volume 3, Numéro 2-4, 2012, pp. 203-222
DOI: 10.1615/HeatPipeScieTech.2013006554
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RÉSUMÉ

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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