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Transport Phenomena in Thermal Engineering. Volume 2

ISBN:
1-56700-015-0 (Print)

HEAT TRANSFER CHARACTERISTICS OF THE PIN-FIN HEAT SINK (MECHANISM AND EFFECT OF TURBULENCE IN THE PIN ARRAY)

Ko Minakami
Tokyo University of Agriculture and Technology, 2-24-16, Naka-cho, Koganei-shi, Tokyo 184, JAPAN; Energy and Mechanical Research Laboratories, Research and Development Center, Toshiba Corporation, 1, Toshiba Cho, Saiwai Ku, Kawasaki, 210, Japan

Sadanari Mochizuki
Tokyo University of Agriculture and Technology, 2-24-16, Naka-cho, Koganei-shi, Tokyo 184, JAPAN

Akira Murata
Department of Mechanical Systems Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan

Yoshinao Yagi
Tokyo University of Agriculture and Technology, Koganei, Tokyo 184, Japan

Hideo Iwasaki
Research and Development Center, Toshiba Corporation, 4-1, Ukishima-cho, Kawasaki-ku, Kawasaki 210, JAPAN

Abstract

Heat transfer and pressure loss performances are experimentally studied for the flow through the pin-fin arrays, which consist of closely arranged very thin pins, in order to investigate the effect of turbulence on the heat transfer mechanisms. The flow visualization tests were carried out for enlarged pin array models using a dye injection technique. Heat transfer tests utilizing a modified single blow transient testing method were also conducted. The range of the Reynolds number tested is 20 - 100. The test results showed that the predominant factor of oscillation mechanism in the pin array is the perturbation accumulation from the inlet region. The effect of the oscillating flow on the heat transfer performance has been clarified quantitatively.