Vertical, Bubbly, Cross-Flow Characteristics over Tube Bundles |
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| Authors: | C Iwaki K H Cheong H Monji G Matsui |
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| Institution: | (1) Power & Industrial Systems Research & Development Center, Toshiba Corporation, Shinsugita-cho, Yokohama 235-8523, Japan;(2) Institute of Engineering Mechanics and Systems, University of Tsukuba, Tsukuba 305-8573, Japan;(3) Department of Mechanical Engineering and Biometics, Kinki University, Uchita-cho, Wakayama 649-6494, Japan |
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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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