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

    74 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

    Fingerprint

    refrigerants
    Refrigerants
    heat transfer coefficients
    Heat transfer coefficients
    proposals
    Condensation
    condensation
    tubes
    condensing
    Liquid films
    shear stress
    Heat flux
    Shear stress
    heat flux
    Gravitation
    Vapors
    vapors
    gravitation
    liquids

    All Science Journal Classification (ASJC) codes

    • Condensed Matter Physics
    • Mechanical Engineering

    Cite this

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    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{\%}.",
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    T1 - Condensation of Refrigerants HCFC 22, HFC 134a and HCFC 123 in a Horizontal Smooth Tube

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    AU - Haraguchi, Hidetaka

    AU - Koyama, Shigeru

    AU - Fujii, Tetsu

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    N2 - 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%.

    AB - 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%.

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