HFC およびHFO 系冷媒の水平微細流路内凝縮:-矩形流路内熱伝達の予測モデル-

Translated title of the contribution: Condensation of HFC and HFO Refrigerants in Horizontal Mini-Channels:-Prediction Model of Heat Transfer in Rectangular Channels-

地下 大輔, 小山 繁

    Research output: Contribution to journalArticle

    Abstract

    In this study, the condensation process of pure and near-azeotropic refrigerants in a horizontal multi-port tube having 17 rectangular mini-channels is investigated experimentally. The measured heat transfer coefficient is influenced mainly by the vapor shear stress and surface tension. We developed a new prediction model on heat transfer based on the following main assumptions: (1) in the annular flow region, the heat transfer correlation isexpressed as the combination of the vapor shear stress controlled term and the surface tension controlled term, (2) in the plug flow region, the heat transfer characteristic of the vapor plug is the same as the annular flow region, while that of liquid slug is the same as liquid single flow, (3) the annular flow is treated as the plug flow with the long vapor plug and the short liquid slug. The new heat transfer correlation agrees well with the experimental data of R134a, R32, R1234ze(E) and R410A in horizontal rectangular mini-channels within 40 % in deviation.
    Original languageJapanese
    Pages (from-to)421-432
    Number of pages12
    Journal日本冷凍空調学会論文集
    Volume29
    Issue number4
    DOIs
    Publication statusPublished - 2012

    Fingerprint

    Refrigerants
    Condensation
    Vapors
    Heat transfer
    Surface tension
    Shear stress
    Liquids
    Heat transfer coefficients

    Cite this

    HFC およびHFO 系冷媒の水平微細流路内凝縮:-矩形流路内熱伝達の予測モデル-. / 地下大輔; 小山繁.

    In: 日本冷凍空調学会論文集, Vol. 29, No. 4, 2012, p. 421-432.

    Research output: Contribution to journalArticle

    @article{8596c3df751d463687009d3b380b70d6,
    title = "HFC およびHFO 系冷媒の水平微細流路内凝縮:-矩形流路内熱伝達の予測モデル-",
    abstract = "In this study, the condensation process of pure and near-azeotropic refrigerants in a horizontal multi-port tube having 17 rectangular mini-channels is investigated experimentally. The measured heat transfer coefficient is influenced mainly by the vapor shear stress and surface tension. We developed a new prediction model on heat transfer based on the following main assumptions: (1) in the annular flow region, the heat transfer correlation isexpressed as the combination of the vapor shear stress controlled term and the surface tension controlled term, (2) in the plug flow region, the heat transfer characteristic of the vapor plug is the same as the annular flow region, while that of liquid slug is the same as liquid single flow, (3) the annular flow is treated as the plug flow with the long vapor plug and the short liquid slug. The new heat transfer correlation agrees well with the experimental data of R134a, R32, R1234ze(E) and R410A in horizontal rectangular mini-channels within 40 {\%} in deviation.",
    author = "大輔 地下 and 繁 小山",
    year = "2012",
    doi = "10.11322/tjsrae.29.421",
    language = "Japanese",
    volume = "29",
    pages = "421--432",
    journal = "日本冷凍空調学会論文集",
    issn = "1344-4905",
    publisher = "公益社団法人 日本冷凍空調学会",
    number = "4",

    }

    TY - JOUR

    T1 - HFC およびHFO 系冷媒の水平微細流路内凝縮:-矩形流路内熱伝達の予測モデル-

    AU - 地下, 大輔

    AU - 小山, 繁

    PY - 2012

    Y1 - 2012

    N2 - In this study, the condensation process of pure and near-azeotropic refrigerants in a horizontal multi-port tube having 17 rectangular mini-channels is investigated experimentally. The measured heat transfer coefficient is influenced mainly by the vapor shear stress and surface tension. We developed a new prediction model on heat transfer based on the following main assumptions: (1) in the annular flow region, the heat transfer correlation isexpressed as the combination of the vapor shear stress controlled term and the surface tension controlled term, (2) in the plug flow region, the heat transfer characteristic of the vapor plug is the same as the annular flow region, while that of liquid slug is the same as liquid single flow, (3) the annular flow is treated as the plug flow with the long vapor plug and the short liquid slug. The new heat transfer correlation agrees well with the experimental data of R134a, R32, R1234ze(E) and R410A in horizontal rectangular mini-channels within 40 % in deviation.

    AB - In this study, the condensation process of pure and near-azeotropic refrigerants in a horizontal multi-port tube having 17 rectangular mini-channels is investigated experimentally. The measured heat transfer coefficient is influenced mainly by the vapor shear stress and surface tension. We developed a new prediction model on heat transfer based on the following main assumptions: (1) in the annular flow region, the heat transfer correlation isexpressed as the combination of the vapor shear stress controlled term and the surface tension controlled term, (2) in the plug flow region, the heat transfer characteristic of the vapor plug is the same as the annular flow region, while that of liquid slug is the same as liquid single flow, (3) the annular flow is treated as the plug flow with the long vapor plug and the short liquid slug. The new heat transfer correlation agrees well with the experimental data of R134a, R32, R1234ze(E) and R410A in horizontal rectangular mini-channels within 40 % in deviation.

    U2 - 10.11322/tjsrae.29.421

    DO - 10.11322/tjsrae.29.421

    M3 - 記事

    VL - 29

    SP - 421

    EP - 432

    JO - 日本冷凍空調学会論文集

    JF - 日本冷凍空調学会論文集

    SN - 1344-4905

    IS - 4

    ER -