TED-AJ03-541 EFFECT OF SURFACE PROPERTIES ON BOILING HEAT TRANSFER CHARACTERISTICS IN A MICRO-CHANNEL VAPORIZER
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概要
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Improving the boiling heat transfer characteristics in a micro-channel vaporizer has become an important issue because of space limitations in a fuel cell vehicle. The process of bubble growth in the micro channel was observed using a high-speed camera to clarify how the surface properties of the heating plate, channel gap and water supply pressure affect heat transfer characteristics and evaporation. The effects of the surface properties of the heating surface and the gap size of the micro channel were mainly evaluated.[figure] Under the experimental conditions used in this study, the results confirmed the following points. (1) Wettability has an effect on heat transfer characteristics in the micro channel mainly in the region of depressed bubbles (2) Water supply pressure mainly affects heat transfer characteristics in the micro channel primarily in the region of oppressed evaporation. (3) With a 0.25 mm gap size in the micro channel, the vertical grooves have a negative effect on heat transfer characteristics, although they have a positive effect on heat transfer characteristics with a 0.5 mm gap size.
著者
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Tasaki Yutaka
Powertrain and Environment Research Laboratory, Nissan Research Center, Nissan Motor Co., Ltd.
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Utaka Yoshio
Department of Mechanical Engineering, Faculty of Engineering, Yokohama National University
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Utaka Yoshio
Department Of Mechanical Engineering And Materials Science Graduate School Yokohama National Univers
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Utaka Yoshio
Department Of Mechanical Engineering Faculty Of Engineering Yokohama National University
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Tasaki Yutaka
Powertrain And Environment Research Laboratory Nissan Research Center Nissan Motor Co. Ltd.
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