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热管科学与技术

ISSN 打印: 2151-7975
ISSN 在线: 2151-7991

Archives: Volume 1, 2010 to Volume 8, 2017

热管科学与技术

DOI: 10.1615/HeatPipeScieTech.2016017224
pages 1-15

LATEST TRENDS IN HEAT PIPE APPLICATION

Masataka Mochizuki
Thermal Technology Division, Fujikura Ltd. 1-5-1, Kiba, Koto-Ku, Tokyo 135, Japan
Thang Nguyen
Thermal Technology Division, Engineering Department, Fujikura Ltd. 1-5-1, Kiba, Koto-Ku, Tokyo 135, Japan
Koichi Mashiko
Fujkura, Limited, 1-5-1, Kiba, Koto-Ku, Tokyo 135-8512, Japan
Yuji Saito
Thermal Technology Division, Engineering Department, Fujikura Ltd. 1-5-1, Kiba, Koto-Ku, Tokyo 135, Japan
Mohammad Shahed Ahamed
Thermal Technology Division, Fujikura Ltd.
Randeep Singh
Thermal Technology Division, Fujikura Ltd, 1-5-1, Kiba, Koto-ku, Tokyo 135-8512, Japan; Fujikura Automotive Europe GmbH, Albin-Kobis Strasse 6, D-51147 Koln
Tien Nguyen
Thermal Technology Division, Fujikura Ltd, 1-5-1, Kiba, Koto-ku, Tokyo 135-8512, Japan
Vijit Wuttijumnong
Thermal Technology Division, Fujikura Ltd, 1-5-1, Kiba, Koto-ku, Tokyo 135-8512, Japan

ABSTRACT

Heat pipe is a best known passive device which is excellent in heat transfer and low thermal resistance. Basically, heat pipe is a two-phase heat transfer device which consists of an evacuated and sealed metal container charged with a small quantity of working fluid. In operation, one end of the container (the evaporator) is heated causing the liquid to vaporize, the vapor moves to the cold end (the condenser) and condenses. The condensate is pump back to the evaporator via the wick which is attached along the container, by the capillary force present in the wick, and the cycle repeats. As the latent heat of evaporation is large, a considerable quantity of heat can be transported with a very small temperature difference from one end to the other end of the heat pipe. Thus, a heat pipe is a device of very high thermal conductance. Its equivalent thermal conductivity can be several hundred times higher than that of a solid copper rod of the same dimensions. Currently, the largest use of heat pipes is for the cooling of computers and electronics products. The present authors believed that approximately 15 million pieces of heat pipes produced per month worldwide are intended for these applications. There are many applications of heat pipes in computer and electronics, automotive, aviation, healthcare, energy saving, global warming, and environmental protection. Fast development in computing technology and the trend towards miniature architecture has created a more challenging task for cooling high-powered electronics components in less space. Thermal solution providers are required to develop higher performance and thinner heat pipes for their cooling devices. This paper contains the latest heat pipe development in thermal performance enhancement; ultrathin heat pipe like 0.4-mm thick and its application in portable tablet and handheld devices such as smart phones. With increase in desired sophisticate control systems and features in vehicle means, more heat dissipation and less space are available for cooling, it seems that the heat pipe becomes a necessity for using in automotive area for cooling components such as head lamps, navigation electronic devices, power drive unit, battery, and fuel, to name a few considered in this paper.


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