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热管科学与技术

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ISSN 打印: 2151-7975

ISSN 在线: 2151-7991

THE INFLUENCE OF GROOVE SHAPE ON LOOP HEAT PIPE PERFORMANCE

卷 3, 册 2-4, 2012, pp. 203-222
DOI: 10.1615/HeatPipeScieTech.2013006554
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摘要

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.

对本文的引用
  1. Nishikawara Masahito, Nagano Hosei, Mottet Laetitia, Prat Marc, Numerical Study of Thermal Performance of a Capillary Evaporator in a Loop Heat Pipe with Liquid-Saturated Wick, Journal of Electronics Cooling and Thermal Control, 04, 04, 2014. Crossref

  2. Shioga Takeshi, Mizuno Yoshihiro, Micro loop heat pipe for mobile electronics applications, 2015 31st Thermal Measurement, Modeling & Management Symposium (SEMI-THERM), 2015. Crossref

  3. Nishikawara M., Nagano H., Optimization of wick shape in a loop heat pipe for high heat transfer, International Journal of Heat and Mass Transfer, 104, 2017. Crossref

  4. Weisenseel Bastian, Greil Peter, Fey Tobias, Biomorphous Silicon Carbide as Novel Loop Heat Pipe Wicks , Advanced Engineering Materials, 19, 1, 2017. Crossref

  5. Nagano Hosei, Kuroi Masakazu, Nishikawara Masahito, Thermofluid Characteristics in Microporous Structure With Different Flow Channels for Loop Heat Pipe, Heat Transfer Engineering, 37, 11, 2016. Crossref

  6. Nishikawara Masahito, Nagano Hosei, Prat Marc, Numerical study on heat-transfer characteristics of loop heat pipe evaporator using three-dimensional pore network model, Applied Thermal Engineering, 126, 2017. Crossref

  7. YAMADA Yuya, NISHIKAWARA Masahito, YANADA Hideki, Numerical exploration of optimal microgroove shape in loop-heat-pipe evaporator, Journal of Thermal Science and Technology, 15, 3, 2020. Crossref

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