Boiling induced heat-transfer enhancement using a narrow space

Masafumi Katsuta*, Katsuya Nagata

*この研究の対応する著者

    研究成果: Conference contribution

    3 被引用数 (Scopus)

    抄録

    A new heat-transfer enhancement technique for originally dried up heat-transfer surface region is suggested by using a bubble pumping effect which is caused by nucleate boiling taking place in a narrow space with the configuration of a concentric double tube evaporator. The fundamental boiling heat-transfer measurement is conducted by boiling pure water at atmospheric pressure using a visualization facility consisting of a plain brass heat-transfer surface and a glass plate. To understand the mechanism of enhancement and to identify the optimum space width and geometry, the experiment is focused on the effect of boiling pattern and void fraction distribution on the heat-transfer coefficient. It has been revealed that the boiling heat-transfer coefficient is significantly enhanced in a narrow space, and particularly, the heat-transfer coefficient increases with increasing void fraction and at approximately between 80 and 90% void fraction the heat-transfer coefficient reaches a maximum. Finally, based on the fundamental study described above, author report on a progress of a high performance evaporator for a personal air conditioning system using new alternative refrigerant HCFC123 to recover the low temperature level waste heat from work station.

    本文言語English
    ホスト出版物のタイトルProc Eng Found Conf Pool External Flow Boiling
    Place of PublicationNew York, NY, United States
    出版社Publ by ASME
    ページ381-386
    ページ数6
    ISBN(印刷版)0791806677
    出版ステータスPublished - 1992
    イベントProceedings of the Engineering Foundation Conference on Pool and External Flow Boiling - Santa Barbara, CA, USA
    継続期間: 1992 3 221992 3 27

    Other

    OtherProceedings of the Engineering Foundation Conference on Pool and External Flow Boiling
    CitySanta Barbara, CA, USA
    Period92/3/2292/3/27

    ASJC Scopus subject areas

    • 工学(全般)

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