Numerical study on the formation of Taylor bubbles in capillary tubes |
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| Authors: | Yuming Chen Rudi Kulenovic Rainer Mertz |
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| Affiliation: | 1. Department of Energy Engineering, Zhejiang University, Hangzhou 310027, China;2. Department of Energy Engineering, Collaborative Innovation Center of Advanced Aero-Engine, Zhejiang University, Hangzhou 310027, China;3. School of Chemical and Biomolecular Engineering, University of Sydney, Sydney, NSW 2006, Australia;1. Faculty of Mechanical Science and Engineering, Chair of Chemical Reaction Engineering and Process Plant, Technische Universität Dresden, D-01062 Dresden, Germany;2. Faculty of Science and Engineering, Laboratory of Industrial Chemistry and Reaction Engineering, Åbo Akademi University, Biskopsgatan 8, FI-20500 Turku (Åbo), Finland |
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| Abstract: | Numerical simulations have been carried out for the transient formation of Taylor bubbles in a nozzle/tube co-flow arrangement by solving the unsteady, incompressible Navier–Stokes equations. A level set method was used to track the two-phase interface. The calculated bubble size, shape, liquid film thickness, bubble length, drift velocity, pressure drop and flow fields of Taylor flow agree well with the literature data. For a given nozzle/tube configuration, the formation of Taylor bubbles is found to be mainly dependent on the relative magnitude of gas and liquid superficial velocity. However, even under the same liquid and gas superficial velocities, the change of nozzle geometry alone can drastically change the size of Taylor bubbles and the pressure drop behavior inside a given capillary. This indicates that the widely used flow pattern map presented in terms of liquid and gas superficial velocities is not unique. |
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