Studies on two-phase cross flow. Part I: Flow characteristics around a cylinder |
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| Affiliation: | 1. School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Sydney, NSW 2006, Australia;2. Institut für Thermodynamik, Universität der Bundeswehr, Munich, Germany;3. School of Mechanical and Mining Engineering, The University of Queensland, Brisbane, QLD 4072, Australia;1. State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;2. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai 200240, China;3. Department of Mechanical and Structural Engineering and Materials Science, University of Stavanger, 4036 Stavanger, Norway;4. Department of Marine Technology, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway |
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| Abstract: | A two-phase flow around a body has scarcely been studied until now, though the flow is used in many industrial components. The cross flows around a spacer in a fuel assembly of light water reactors (LWR) and tube supports in a steam generator are closely related to the long-term reliability and the safety. The present study has been planned to clarify the two-phase flow and heat transfer characteristics around a body including the unknown complicated flow behavior. In the first report, the flow characteristics near and behind a cylinder which was located in a vertical upward air-water bubbly flow were investigated. From the observation of the flow patterns and the measurements of the distributions of void fraction, liquid velocity and static pressure, it is revealed that the vortex flow and the change of the static pressure and liquid velocity distribution around the cylinder resulted in the large distortion of the void fraction distribution around the cylinder. The most noticeable phenomena in the wake were that the peaks of the local void fraction appeared in the vicinity of the cylinder surface near the separation point and in the wake behind the cylinder. |
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