Simulations of bubble growth and interaction in high viscous fluids using the lattice Boltzmann method |
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| Institution: | 2. CDIF, Universitat Politècnica de Catalunya, Barcelona, Spain;3. School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China;4. Mechanical Engineering Department, Escuela Politecnica Nacional University, Quito, Ecuador;1. AIT Austrian Institute of Technology GmbH, Center for Mobility Systems, Transportation Infrastructure Technologies, Giefinggasse 2, 1210 Vienna, Austria;2. TU Wien, Institute of Applied Physics, Wiedner Hauptstr. 8-10/134, 1040 Vienna, Austria;1. Key Laboratory of Condition Monitoring and Control for Power Plant Equipment (Ministry of Education), School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing 102206 China;2. School of Nuclear Science and Engineering, North China Electric Power University, Beijing 102206 China;3. College of Mechanical and Transportation Engineering, China University of Petroleum-Beijing, Beijing 102249 China;4. Beijing Key Laboratory of Process Fluid Filtration and Separation, China University of Petroleum-Beijing, Beijing 102249 China;1. Bernal Institute, University of Limerick, Plassey Park, Limerick, Ireland;2. Transport Phenomena Lab, Department of Chemical Engineering, Delft University of Technology, Van der Maasweg 9, 2629 HZ Delft, Netherlands |
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| Abstract: | Phenomena of growth, coalescence and breakdown of bubbles within high viscous fluids are of great interest in the fluid dynamics of multiphase fluids because of their industrial relevance, e.g. in polymer, metal alloy and food processing fields. The dynamics of multiple bubble growth in hot viscous fluids is a complex issue governed by pressure forces, vapour diffusion, surface tension and viscous forces. Effects of water evaporation from the mixture surface are responsible for phenomena like glass transition, viscous increase and dough solidification. This article presents Lattice Boltzmann simulations of nucleating bubbles with large density ratio, that grow and interact in a hot high-viscous fluid. The work focuses on the first phases of the bubble expansion, neglecting the effects of evaporation. The simulations are performed using the Lattice Boltzmann Method (LBM). The Free Surface method is used to reduce a liquid/gas two-phase flow to a single-phase flow. The interface layer between gas and fluid is tracked using the volume of fluid (VOF) method. To avoid numerical instabilities due to the high viscosity (), the problem is scaled from physical to LB-units through non-dimensional quantities. The bubbles are initially punched randomly into the domain with a dimension comparable with the dimension of nucleation and are allowed to grow under an internal over-pressure. The simulated final structure of the bubbles is compared with images of a pure starch fluid, extruded under same conditions. It is shown as the final bubble distribution, matrix dimension and bubble diameters in the simulation are in good agreement with the real final conformation. |
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