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Vertical, Bubbly, Cross-Flow Characteristics over Tube Bundles

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Abstract

Two-phase flow over tube bundles is commonly observed in shell and tube-type heat exchangers. However, only limited amount of data concerning flow pattern and void fraction exists due to the flow complexity and the difficulties in measurement. The detailed flow structure in tube bundles needs to be understood for reliable and effective design. Therefore, the objective of this study was to clarify the two-phase structure of cross-flow in tube bundles by PIV. Experiments were conducted using two types of models, namely in-line and staggered arrays with a pitch-to-diameter ratio of 1.5. Each test section contains 20 rows of five 15 mm O.D. tubes in each row. The experiment’s data were obtained under very low void fraction (α<0.02). Liquid and gas velocity data in the whole flow field were measured successfully by optical filtering and image processing. The structures of bubbly flow in the two different configurations of tube bundles were described in terms of the velocity vector field, turbulence intensity and void fraction.

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Authors and Affiliations

  1. Power & Industrial Systems Research & Development Center, Toshiba Corporation, Shinsugita-cho, Yokohama, 235-8523, Japan

    C. Iwaki

  2. Institute of Engineering Mechanics and Systems, University of Tsukuba, Tsukuba, 305-8573, Japan

    K. H. Cheong & H. Monji

  3. Department of Mechanical Engineering and Biometics, Kinki University, Uchita-cho, Wakayama, 649-6494, Japan

    G. Matsui

Authors
  1. C. Iwaki
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  2. K. H. Cheong
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  3. H. Monji
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  4. G. Matsui
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Correspondence to C. Iwaki.

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Iwaki, C., Cheong, K.H., Monji, H. et al. Vertical, Bubbly, Cross-Flow Characteristics over Tube Bundles. Exp Fluids 39, 1024–1039 (2005). https://doi.org/10.1007/s00348-005-0036-2

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  • DOI: https://doi.org/10.1007/s00348-005-0036-2

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