Hydrodynamics of two-phase flow in vertical up and down-flow across a horizontal tube bundle |
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| Institution: | 1. Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai 200240, China;2. R&D Center, CNOOC Gas&Power Group, Beijing 100007, China;1. Natural Fluids Refrigeration Center, GIK Institute, Topi, Pakistan;2. Isotherm, Inc., 7401 Commercial Blvd. E., Arlington, TX 76001, USA;3. Energy Engineering, Zhejiang University, Hangzhou, China;4. Higher College of Technology, Abu Dhabi, United Arab Emirates;5. Heat Transfer Research Group, University of São Paulo, São Carlos, Brazil |
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| Abstract: | Flow patterns, void fraction and friction pressure drop measurements were made for an adiabatic, vertical up-and-down, two-phase flow of air–water mixtures across a horizontal in-line, 5×20 tube bundle with a pitch-to-diameter ratio of 1.28. The flow patterns in the cross-flow zones were obtained and flow pattern maps were constructed. The data of average void fraction were less than the values predicted by a homogenous flow model and showed a strong mass velocity effect, but were well-correlated in terms of the Martinelli parameter Xtt and liquid-only Froude number FrLO. The two-phase friction multiplier data could be well-correlated with the Martinelli parameter. |
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