Falling film evaporation of pure refrigerant HCFC123 in a vertical rectangular channel with serrated-fins

Shigeru Koyama, Junichi Ohara, Ken Kuwahara, Kenichi Masaki

    Research output: Contribution to journalConference articlepeer-review

    1 Citation (Scopus)

    Abstract

    In the present study, the characteristics of heat transfer and flow patterns are experimentally investigated on the falling film evaporation of pure refrigerant HCFC123 in a vertical rectangular channel with serrated-fins. The experimental ranges are as follows: the mass velocity G = 28 to approximately 70 kg/(m2s), the heat flux q = 30,50 kW/m2 and the pressure 100 kPa. It is clarified that the heat transfer coefficient α depends on G and q in the region of vapor quality x≥0.3, while there is little influence of G and q in the region x≤0.3. From the direct observation, flow patterns are classified into five typical ones: plane liquid film, wavy liquid film, liquid film accompanied with dry patch, liquid film accompanied with dripping and liquid film accompanied with mist. An empirical correlation equation for evaporation heat transfer coefficient in a falling film plate-fin evaporator is also proposed, taking fin efficiency into consideration.

    Original languageEnglish
    Pages (from-to)339-346
    Number of pages8
    JournalAmerican Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD
    Volume361-1
    Publication statusPublished - Dec 1 1998
    EventProceedings of the 1998 ASME International Mechanical Engineering Congress and Exposition - Anaheim, CA, USA
    Duration: Nov 15 1998Nov 20 1998

    All Science Journal Classification (ASJC) codes

    • Mechanical Engineering
    • Fluid Flow and Transfer Processes

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