Condensation of Refrigerants HCFC 22, HFC 134a and HCFC 123 in a Horizontal Smooth Tube: (2nd Report, Proposals of Empirical Expressions for Local Heat Transfer Coefficient)

Hidetaka Haraguchi, Shigeru Koyama, Tetsu Fujii

    Research output: Contribution to journalArticle

    75 Citations (Scopus)

    Abstract

    The local heat transfer coefficients of refrigerants HCFC 22, HFC 134a and HCFC 123 condensing inside a horizontal smooth tube are measured in the ranges of total mass velocity of 90 to 400 kg/(m2.s) and heat flux of 3 to 33 kW/m2. Based on the turbulent liquid film theory and Nusselt's theory, an empirical equation for the heat transfer coefficient is proposed in the form of Nu=(Nuf2+ Nub2)1/2, where NuFexpresses the effect of vapor shear stress and NuBthe effect of gravity force. This equation correlates the experimental results within an error of ±20%.

    Original languageEnglish
    Pages (from-to)2117-2124
    Number of pages8
    JournalTransactions of the Japan Society of Mechanical Engineers Series B
    Volume60
    Issue number574
    DOIs
    Publication statusPublished - Jan 1 1994

    All Science Journal Classification (ASJC) codes

    • Condensed Matter Physics
    • Mechanical Engineering

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