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Technical Briefs

Effects of a High Porous Material on Heat Transfer and Flow in a Circular Tube

[+] Author and Article Information
Koichi Ichimiya

Interdisciplinary Graduate School of Medicine and Engineering, Mechanical Systems Engineering Division, University of Yamanashi, Takeda-4, Kofu, Yamanashi 400-8511, Japanichimiya@yamanashi.ac.jp

Tetsuaki Takeda

Interdisciplinary Graduate School of Medicine and Engineering, Mechanical Systems Engineering Division, University of Yamanashi, Takeda-4, Kofu, Yamanashi 400-8511, Japan

Takuya Uemura

 Yamatake Co Ltd., Marunouchi, Chiyoda, Tokyo 100-6419, Japan

Tetsuya Norikuni

 Tekumo Co Ltd., Fujisawa, Kanagawa 252-0815, Japan

J. Heat Transfer 131(2), 024503 (Dec 29, 2008) (4 pages) doi:10.1115/1.2994713 History: Received January 09, 2008; Revised July 28, 2008; Published December 29, 2008

This paper describes the heat transfer and flow characteristics of a heat exchanger tube filled with a high porous material. Fine copper wires (diameter: 0.5 mm) were inserted in a circular tube dominated by thermal conduction and forced convection. The porosity was from 0.98 to 1.0. The working fluid was air. The hydraulic equivalent diameter was cited as the characteristic length in the Nusselt number and the Reynolds number. The Nusselt number and the friction factor were expressed as functions of the Reynolds number and porosity. The thermal performance was evaluated by the ratio of the Nusselt number with and without a high porous material and the entropy generation. It was recognized that the high porous material was effective in low Reynolds numbers and the Reynolds number, which minimized the entropy generation existed.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Hydraulic equivalent diameter DH (dw=0.5 mm and D=25 mm)

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Figure 2

Relationship between Nu and Re

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Figure 3

Relationship between fm and Re

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Figure 4

Thermal performance by Nu/Nuo; pumping power=const

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Figure 5

Thermal performance by entropy generation: (a) entropy generation Sg and (b) entropy generation ratio Sg/Sgo

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