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International Heat Transfer Conference 16

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

HEAT TRANSFER CHARACTERISTICS OF A GAS FLOW IN UNI-DIRECTIONAL POROUS COPPER PIPES

Y. Sato
Tokyo University of Science-Yamaguchi, 1-1-1 Daigakudori, Sanyo-Onoda, Yamaguchi 756-0884, Japan

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

Y. Abe
Tokyo University of Science-Yamaguchi, 1-1-1 Daigakudori, 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

K. Hokamoto
Kumamoto University, 1-39-2 Kurokami, Tyuo-ku, Kumamoto 860-8555 Japan

S. Tanaka
Kumamoto University, 1-39-2 Kurokami, Tyuo-ku, Kumamoto 860-8555 Japan

Toshio Tomimura
Kumamoto University, 1-39-2 Kurokami, Tyuo-ku, Kumamoto 860-8555 Japan

DOI: 10.1615/IHTC16.pma.024153
pages 8189-8193


KEY WORDS: Porous media, Heat transfer enhancement, uni-directional porous copper

Abstract

Heat transfer and pressure loss characteristics of a gas flow in a uni-directional porous copper pipe are experimentally evaluated. The porous copper pipe is fabricated by explosive welding technique and is expected as a heat transfer promoter for heat exchangers, evaporators, heat sinks etc. In this study, the heat transfer and pressure loss characteristics of a gas flow in the porous pipes are evaluated by making use of a double-tube heat exchanger in which the porous copper pipe is used as an inner pipe. The porous copper pipe has the outer diameter of 21 mm and the average pore diameter of approximately 4 mm. The heat transfer is evaluated in the range of the inlet flow velocity from 1 m/s to 16 m/s. As a result, it is verified that the heat transfer of the porous copper pipe is even much higher than that of a swirl flow and a ribbed pipe flow as well as that of the circular pipe flow. From the view point of the pumping power, it is also proven that the uni-directional porous copper pipe has more superior heat transfer performance though we have to make an effort to reduce the pressure loss.

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