超臨界圧域における二酸化炭素の水平内面ら旋溝付管内の冷却熱伝達に関する実験的研究

Translated title of the contribution: Experimental Study on Cooling Heat Transfer of Supercritical Carbon Dioxide Inside Horizontal Micro-Fin Tubes

桑原 憲, 東井上 真哉, 伊東 大輔, 小山 繁

    Research output: Contribution to journalArticle

    Abstract

    This paper deals with the experimental study on cooling heat transfer of supercritical carbon dioxide inside micro-fin tubes. The geometrical parameters in micro-fin tubes used in the present study are 6.02 mm in outer diameter, 4.76 mm to 5.11 mm in average inner diameter, 0.15 mm to 0.24 mm in fin height, 5 to 25 in helix angle, 46 to 52 in number of fins and 1.4 to 2.3 in area expansion ratio. Heat transfer coefficients were measured at 8-10 MPa in pressure, 360-690 kg/(m<Sup>2</Sup>•s) in mass velocity and 20-75 °C in CO<Sub>2</Sub> temperature. The measured heat transfer coefficients of micro-fin tubes were 1.4 to 2 times higher than those of the smooth tube having 4.42 in inner diameter. The predicted heat transfer coefficients using the correlation equation, which was developed for single-phase turbulent fluid flow inside micro-fin-tubes, showed large deviations to the measured values. The new correlation to predict cooling heat transfer coefficient of supercritical carbon dioxide inside micro-fin tubes was developed taking into account the shape of fins based on experimental data empirically. This correlation equation agreed within ±20% of almost all of the experimental data.
    Original languageJapanese
    Pages (from-to)173-181
    Number of pages9
    Journal日本冷凍空調学会論文集
    Volume24
    Issue number3
    DOIs
    Publication statusPublished - 2007

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