水平ら旋溝付管内における二酸化炭素沸騰流のボイド率に関する実験的研究

Translated title of the contribution: Experiments on Void Fraction of CO<Sub>2</Sub> Flow Boiling in a Horizontal Micro-fin Tube

近藤 智恵子, 東井上 真哉, 桑原 憲, 小山 繁

    Research output: Contribution to journalArticle

    Abstract

    This paper deals with an experimental investigation on the void fraction of CO<Sub>2</Sub> flow boiling in a horizontal micro-fin tube. The mean void fraction in the insulated 400 mm length sampling section, which is located next to the test evaporator, has measured by the quick closing valve method. The experimental data have been obtained in mass flux range of 200 to 455 kg/(m<Sup>2</Sup>s) and the refrigerant pressure range of 3.5 to 5.0 MPa. It is confirmed that the relation between void fraction and quality is affected by both mass flux and pressure. The experimental results are also compared with two previous correlations for horizontal smooth tubes, which are proposed by Butterworth and Smith. The present data satisfactorily agreed with Butterworth's correlation in the range of quality from 0.03 to 0.99. However, Smith's correlation is found to predict slightly higher than present data. As a trial, the empirical correlation of void fraction, based on the experimental slip ratios, is proposed.
    Original languageJapanese
    Pages (from-to)55-62
    Number of pages8
    Journal日本冷凍空調学会論文集
    Volume25
    Issue number1
    DOIs
    Publication statusPublished - 2008

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    Void fraction
    Boiling liquids
    Mass transfer
    Experiments
    Refrigerants
    Evaporators
    Sampling

    Cite this

    水平ら旋溝付管内における二酸化炭素沸騰流のボイド率に関する実験的研究. / 近藤智恵子; 東井上真哉; 桑原憲; 小山繁.

    In: 日本冷凍空調学会論文集, Vol. 25, No. 1, 2008, p. 55-62.

    Research output: Contribution to journalArticle

    近藤智恵子 ; 東井上真哉 ; 桑原憲 ; 小山繁. / 水平ら旋溝付管内における二酸化炭素沸騰流のボイド率に関する実験的研究. In: 日本冷凍空調学会論文集. 2008 ; Vol. 25, No. 1. pp. 55-62.
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    abstract = "This paper deals with an experimental investigation on the void fraction of CO<Sub>2 flow boiling in a horizontal micro-fin tube. The mean void fraction in the insulated 400 mm length sampling section, which is located next to the test evaporator, has measured by the quick closing valve method. The experimental data have been obtained in mass flux range of 200 to 455 kg/(m<Sup>2s) and the refrigerant pressure range of 3.5 to 5.0 MPa. It is confirmed that the relation between void fraction and quality is affected by both mass flux and pressure. The experimental results are also compared with two previous correlations for horizontal smooth tubes, which are proposed by Butterworth and Smith. The present data satisfactorily agreed with Butterworth's correlation in the range of quality from 0.03 to 0.99. However, Smith's correlation is found to predict slightly higher than present data. As a trial, the empirical correlation of void fraction, based on the experimental slip ratios, is proposed.",
    author = "智恵子 近藤 and 真哉 東井上 and 憲 桑原 and 繁 小山",
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    AU - 近藤, 智恵子

    AU - 東井上, 真哉

    AU - 桑原, 憲

    AU - 小山, 繁

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    AB - This paper deals with an experimental investigation on the void fraction of CO<Sub>2 flow boiling in a horizontal micro-fin tube. The mean void fraction in the insulated 400 mm length sampling section, which is located next to the test evaporator, has measured by the quick closing valve method. The experimental data have been obtained in mass flux range of 200 to 455 kg/(m<Sup>2s) and the refrigerant pressure range of 3.5 to 5.0 MPa. It is confirmed that the relation between void fraction and quality is affected by both mass flux and pressure. The experimental results are also compared with two previous correlations for horizontal smooth tubes, which are proposed by Butterworth and Smith. The present data satisfactorily agreed with Butterworth's correlation in the range of quality from 0.03 to 0.99. However, Smith's correlation is found to predict slightly higher than present data. As a trial, the empirical correlation of void fraction, based on the experimental slip ratios, is proposed.

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