Flow pattern and flow characteristics for counter-current two-phase flow in a vertical round tube with wire-coil inserts

H. Y. Kim, S. Koyama, W. Matsumoto

    研究成果: Contribution to journalArticle査読

    37 被引用数 (Scopus)

    抄録

    Flow pattern, void fraction and slug rise velocity on counter-current two-phase flow in a vertical round tube with wire-coil inserts are experimentally studied. Flow pattern and slug rise velocity are measured visually with a video camera. The void fraction is measured by the quick-closing valve method. Four kinds of coils with different coil pitches and coil diameters are used as inserts. The presence of wire-coil inserts induces disturbance into gas and liquid flows so that the shape and motion of gas slug or bubbles in a wire-coil inserted tube are quite different from those observed in a smooth tube without insert. The bubbly flow occurs in the low gas superficial velocity region in the wire-coil inserted tube, while the slug or churn/annular flow only appears in the smooth tube without insert over the all test range. The measured slug rise velocity in the wire-coil inserted tube is higher than that in the smooth tube. With modified mean flow velocity calculated with core area, the slug rise velocity in wire-coil tube inserted is in good agreement with Nicklin's correlation. The void fraction in a wire-coil inserted tube is lower than that in a smooth tube in the range of high gas superficial velocities. By introducing a simple assumption on considering the effective flowing area, the measured void fractions in a wire-coil inserted tube are in relatively good agreement with the predicted result based on the drift flux model proposed by others with the correlation for slug rise velocity given by others when the coil pitch is dense.

    本文言語英語
    ページ(範囲)2063-2081
    ページ数19
    ジャーナルInternational Journal of Multiphase Flow
    27
    12
    DOI
    出版ステータス出版済み - 12 2001

    All Science Journal Classification (ASJC) codes

    • 機械工学
    • 物理学および天文学(全般)
    • 流体および伝熱

    フィンガープリント

    「Flow pattern and flow characteristics for counter-current two-phase flow in a vertical round tube with wire-coil inserts」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

    引用スタイル