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International Heat Transfer Conference 16

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

TWO-PHASE FLOW BOILING AND EVAPORATIVE HEAT TRANSFER PROMOTED WITH UNI-DIRECTIONAL POROUS COPPER

Kio Takai
Tokyo University of Science, Yamaguchi, 1-1-1 Daigaku-dori, Sanyo-Onoda, Yamaguchi 756-0884, Japan

K. Yuki
Tokyo University of Science-Yamaguchi, 1-1-1 Daigakudori, Sanyo-Onoda, Yamaguchi 756-0884, Japan

S. Yang
Tokyo University of Science, Yamaguchi, 1-1-1 Daigaku-dori, Sanyo-Onoda, Yamaguchi 756-0884, Japan

Risako Kibushi
Department of Mechanical Engineering, Tokyo University of Science, Yamaguchi, 1-1-1 Digakudo-ri, Sanyo-onoda, Yamaguchi, 756-0884 Japan

Noriyuki Unno
Department of Mechanical Engineering, Tokyo University of Science, Yamaguchi, 1-1-1 Digakudo-ri, Sanyo-onoda, Yamaguchi, 756-0884 Japan

DOI: 10.1615/IHTC16.pma.023683
pages 8143-8147


KEY WORDS: Porous media, Electronic equipment cooling, Uni-directional porous copper, Evaporative heat transfer, High heat flux

Abstract

Uni-directional porous media have straight pore hole in uni-direction, and is expected such as reduction of flow resistance inside the pore hole, promotion of heat transfer to a cooling liquid by microchannel flow path, and fin effect utilizing high effective thermal conductivity in the direction parallel to the pore. In this study, two-phase flow boiling and evaporation heat transfer characteristics are evaluated using a cooling device EVAPORON-4 with a uni-directional porous copper that promote boiling and evaporation. The uni-directional porous copper is made of oxygen-free copper in the diameter of 20 mm, and is formed cooling liquid supplying pore holes (Φ 0.5 mm × 248) and vapor discharging pore holes (Φ 2.6 mm × 5) by machining. The porous medium is soldered on the grooved heat transfer surface. The cooling liquid is supplied to the heat transfer surface from the supply pore holes of the porous medium and is discharged to the outside of the porous medium from the discharge pore holes via grooves. Distilled water is used as cooling liquid. In a boiling heat transfer experiment conducted with a constant flow rate, a high heat flux of 945 W/cm2 is achieved at the flow rate of 1.0 L/min, the liquid subcooling of 40 K.

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