R744の扁平多孔管内凝縮に関する実験

Translated title of the contribution: Experiments on Condensation of R744 in a Multi-Port Extruded Tube

地下 大輔, 桑原 憲, 小山 繁

    Research output: Contribution to journalArticle

    Abstract

    In this study, pressure drop and local heat transfer characteristics for the condensation process of R744 were measured experimentally in a horizontal multi-port extruded tube of 0.36 mm in hydraulic diameter. Experiments were carried out in the mass velocity range of 470 to 830 kg/(m<sup>2</sup> s) at pressure 5, 6 and 7 MPa. The pressure drop was measured between both ends of the test section of approximately 730 mm in length. The local heat transfer was measured in eight subsections of 75 mm in effective heating length. The measured pressure drop was compared with several correlations. The correlations of Friedel and Mishima - Hibiki comparatively show a good agreement at pressure of 5, 6 and 7 MPa. The local heat transfer coefficients were also compared with several correlations. The high vapor quality data agree comparatively with correlations of Moser et al. and Cavallini et al., while other data do not agree with any correlations well. The present experimental results suggest that the condensation in a rectangular mini channel is controlled not only by forced convection effect, but also by surface tension effect.
    Original languageJapanese
    Pages (from-to)49-56
    Number of pages8
    Journal日本冷凍空調学会論文集
    Volume27
    Issue number1
    DOIs
    Publication statusPublished - Mar 31 2010

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    Pressure drop
    Condensation
    Heat transfer
    Experiments
    Forced convection
    Heat transfer coefficients
    Surface tension
    Vapors
    Hydraulics
    Heating

    Cite this

    R744の扁平多孔管内凝縮に関する実験. / 地下大輔; 桑原憲; 小山繁.

    In: 日本冷凍空調学会論文集, Vol. 27, No. 1, 31.03.2010, p. 49-56.

    Research output: Contribution to journalArticle

    地下大輔 ; 桑原憲 ; 小山繁. / R744の扁平多孔管内凝縮に関する実験. In: 日本冷凍空調学会論文集. 2010 ; Vol. 27, No. 1. pp. 49-56.
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    AU - 地下, 大輔

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    AU - 小山, 繁

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    AB - In this study, pressure drop and local heat transfer characteristics for the condensation process of R744 were measured experimentally in a horizontal multi-port extruded tube of 0.36 mm in hydraulic diameter. Experiments were carried out in the mass velocity range of 470 to 830 kg/(m2 s) at pressure 5, 6 and 7 MPa. The pressure drop was measured between both ends of the test section of approximately 730 mm in length. The local heat transfer was measured in eight subsections of 75 mm in effective heating length. The measured pressure drop was compared with several correlations. The correlations of Friedel and Mishima - Hibiki comparatively show a good agreement at pressure of 5, 6 and 7 MPa. The local heat transfer coefficients were also compared with several correlations. The high vapor quality data agree comparatively with correlations of Moser et al. and Cavallini et al., while other data do not agree with any correlations well. The present experimental results suggest that the condensation in a rectangular mini channel is controlled not only by forced convection effect, but also by surface tension effect.

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