Mechanical Engineering:

Title:            Prototype Experiment on Cooling Performance of a JEST-type Loop Heat Pipe
Authors:       Ayaka Suzuki, Kaoru Sato, Yasushi Koito, Toshio Tomimura
Abstract:     The cooling of such high-performance electronic devices as CPUs and power semiconductors is one technical challenge that significantly affects the practical applications of electronic hardware mounting them. In recent years, the heat density of these devices has significantly increased due to higher output and downsizing. The required cooling performance for such high-performance electronic devices will increase even more in the near future. Therefore we propose a new cooling technology called a JEST-type Loop Heat Pipe (JEST-LHP) that satisfies the required performance: higher output and higher heat density. Similar to conventional loop heat pipes, this new heat pipe consists of an evaporator section, a condenser section, and two pipes (a vapor line and a liquid line) as well as unique Jet Explosion Stream Technology (JEST) that enhances the heat transfer in the evaporator section. We fabricated a prototype heat pipe and conducted fundamental experiments on the cooling performance. In our experiments, the evaporator section was heated by a small heater whose heating area was 400 mm2, and the condenser section was air-cooled by a fan. Water was employed as the working fluid. Our experimental results confirmed that the maximum heat transport rate of our present heat pipe was 780 W. This value corresponds to a heat flux of 195 W/cm 2, and we obtained a total thermal resistance of 0.130 K/W.

Keywords:   Loop Heat Pipe, Two-Phase Heat Transfer, JEST, Evaporation, Electronics Cooling
Pages:         095-098

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