An initially spherical bubble rising near a vertical wall |
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| Institution: | 1. School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907, USA;2. Department of Agricultural and Biological Engineering, Purdue University, West Lafayette, IN 47907, USA;3. State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;4. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai 200240, China |
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| Abstract: | The dynamics of a single rising bubble in the vicinity of a vertical wall is explored via three-dimensional numerical simulations. A finite volume method is used to solve the incompressible Navier–Stokes equations. The gas–liquid interface is reconstructed by volume-of-fraction (VOF) method. The trajectory, velocity, shape and vorticity of the bubble are analyzed in detail. The numerical results show that the presence of the wall imposes a repulsion on the bubble and that the bubble migrates away from the wall upon release. The onset of bubble path oscillation is found to occur earlier than for a freely rise counterpart and also at a lower Galilei number. Interestingly, we find that the vertical wall serves as a destabilizing factor in the wall-normal direction but a stabilizing factor in the spanwise direction. The increase of bubble inertia is discovered to enhance the influence of the wall. Furthermore, the bubble oscillations seem insensitive to the variation of the initial bubble-wall distance. |
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| Keywords: | Bubble dynamics Wall effect Three-dimensional simulation VOF |
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