Condensation of refrigerant in a multi-port channel

Shigeru Koyama, Ken Kuwahara, Koichi Nakashita

    研究成果: Chapter in Book/Report/Conference proceedingConference contribution

    80 被引用数 (Scopus)

    抄録

    In the present paper, the local characteristics of pressure drop and heat transfer are investigated experimentally for the condensation of pure refrigerant R134a in four kinds of multi-port extruded aluminum tubes of about 1 mm in hydraulic diameter. Two tubes are composed of plane rectangular channels, while remaining two tubes are composed of rectangular channels with straight micro-fins. The experimental data of frictional pressure drop (FPD) and heat transfer coefficient (HTC) in plane tubes are compared with previous correlations, most of which are proposed for the condensation of pure refrigerant in a relatively large diameter tube. It is confirmed that parameters such as tube diameter, surface tension, free convection in FPD and HTC correlations should be taken into account more precisely. Considering the effects of surface tension and kinematic viscosity, new correlation of FPD is developed based on the Mishima-Hibiki correlation. New correlation of HTC is also developed modifying the effect of diameter in the correlation of Haraguchi et al. Both new correlations are compared with experimental data for tubes with micro-fins. Satisfactory agreement between experimental and predicted results is obtained. This means that the micro-fin effect is taken into account by using hydraulic diameter and the heat transfer enhancement effect of micro-fins is mainly due to the enlargement of heat transfer area.

    本文言語英語
    ホスト出版物のタイトルInternational Conference on Microchannels and Minichannels
    出版社American Society of Mechanical Engineers
    ページ193-205
    ページ数13
    ISBN(印刷版)0791836673, 9780791836675
    DOI
    出版ステータス出版済み - 2003
    イベントFirst International Conference on Microchannels and Minichannels - Rochester, NY, 米国
    継続期間: 4 24 20034 25 2003

    出版物シリーズ

    名前International Conference on Microchannels and Minichannels
    1

    その他

    その他First International Conference on Microchannels and Minichannels
    Country米国
    CityRochester, NY
    Period4/24/034/25/03

    All Science Journal Classification (ASJC) codes

    • Engineering(all)

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