Condensation of refrigerant in a multi-port channel

Shigeru Koyama, Ken Kuwahara, Koichi Nakashita

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    79 Citations (Scopus)

    Abstract

    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.

    Original languageEnglish
    Title of host publicationInternational Conference on Microchannels and Minichannels
    PublisherAmerican Society of Mechanical Engineers
    Pages193-205
    Number of pages13
    ISBN (Print)0791836673, 9780791836675
    DOIs
    Publication statusPublished - 2003
    EventFirst International Conference on Microchannels and Minichannels - Rochester, NY, United States
    Duration: Apr 24 2003Apr 25 2003

    Publication series

    NameInternational Conference on Microchannels and Minichannels
    Volume1

    Other

    OtherFirst International Conference on Microchannels and Minichannels
    CountryUnited States
    CityRochester, NY
    Period4/24/034/25/03

    All Science Journal Classification (ASJC) codes

    • Engineering(all)

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