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International Heat Transfer Conference 10

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

NATURAL CONVECTION IN POROUS INSULATION LAYERS CONTAINING A ROW OF HEAT PIPES

Takashi Masuoka
The University of Kitakyushu, and Department of Mechanical Engineering, Kyushu University, Kyushu, Japan

Takaharu Tsuruta
Kyushu Institute of Technology, Sensui 1-1, Tobata, Kitakyushu, Fukuoka 804-8550, Japan

Hirofumi Tanigawa
Kyushu Institute of Technology, Japan

H. Izaki
Department of Mechanical Engineering, Kyushu Institute of Technology, JAPAN

DOI: 10.1615/IHTC10.810
pages 385-390

摘要

This study is concerned with the method of improving The performance of insulating porous layers. An advanced insulation technique has been developed by utilizing a thermal screen consisting of a row of heat pipes with very high effective thermal conductivity placed in the insulation layer. An experimental study has been made to clarify the effects of the thermal screen on the convection heat transfer, concentrating on how it introduces the uniformity in the temperature field and reduces the buoyancy force and how it suppresses the internal convection. It is found that the thermal screen introduces strong uniformity such that the temperature distributions approaches the conduction profiles, resulting in the suppression of the onset of convection. The critical or transition Rayleigh number is increased depending on the layout of the heat pipes, confirming the experimental results on the suppression of convection. Then. it is concluded that the thermal screen can provide a very efficient method of control of convection.

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