Particle mixing rates using the two-fluid model |
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| Institution: | 1. Multiphase Reactors Group, Department of Chemical Engineering & Chemistry, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands;2. Dutch Polymer Institute (DPI), 5600 AX Eindhoven, The Netherlands;3. Multiphase and Reactive Flows Group, Department of Mechanical Engineering, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands;1. Department of Chemistry and Chemical Engineering, Chalmers University of Technology, SE-412 96, Göteborg, Sweden;2. Department of Applied Mechanics, Chalmers University of Technology, SE-412 96, Göteborg, Sweden;1. Faculty of Mechanical Engineering, Semnan University, Iran;2. Faculty of Mechanical Engineering, Babol Noshirvani University of Technology, Iran;1. School of Electrical Engineering, Yancheng Institute of Technology, Yancheng 224051, China;2. Institute of Acoustics and Key Laboratory of Modern Acoustics of Ministry of Education, Nanjing University, Nanjing 210093, China |
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| Abstract: | In this work, a new methodology is introduced to calculate the solids mixing rate in dense gas-fluidized beds using the two-fluid model. The implementation of this methodology into an existing two-fluid model code was carefully verified. The solids phase continuity equation was satisfied using our method, and the sensitivity of the computational results to the time step, computational cell size, and discretization scheme was investigated to determine the optimal simulation settings. Using these simulation settings, the degree of solids mixing was observed to rapidly (exponentially) increase with increasing operating pressure and linearly decrease with increasing bed diameter. Our novel methodology can be applied to analyze mixing processes in large lab-scale beds as an alternative to existing time-consuming simulation techniques such as computational fluid dynamics combined with the discrete element model. |
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| Keywords: | Gas–solid fluidized bed Simulation Two-fluid model Solids mixing Pressure Scale up |
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