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Effect of solid mass flux on anisotropic gas–solid flow in risers determined with an LES-SOM model
Institution:1. School of Mechanical Engineering, Harbin University of Science and Technology, Harbin 150080, China;2. No. 703 Research Institute of China Shipbuilding Industry Corporation, Harbin 150001, China;3. School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;1. School of Environmental and Municipal Engineering, Xi''an University of Architecture and Technology, Xi''an 710055, Shaanxi, China;2. College of Urban Construction, Hebei University of Engineering, Handan 056038, Hebei, China;3. Fourth Military Medical University, Xi''an 710032, Shaanxi, China;1. Key Laboratory of Coal Gasification and Energy Chemical Engineering of Ministry of Education, Shanghai Engineering Research Center of Coal Gasification, Institute of Clean Coal Technology, East China University of Science and Technology, Shanghai 200237, China;2. Dipartimento di Ingegneria Industriale, Universita degli Studi di Salerno, Via Giovanni Paolo II, 132, I-84084 Fisciano, SA, Italy;1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China;2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China;3. Institute for Infrastructure and Environment, School of Engineering, The University of Edinburgh, Edinburgh EH9 3JL, United Kingdom;4. Skempton Building, Department of Civil and Environmental Engineering, Imperial College London, London SW7 2AZ, United Kingdom;5. Haking Wong Building, Department of Civil and Environmental Engineering, The University of Hong Kong, Hong Kong, China;1. Department of Chemical and Process Engineering [J2], University of Surrey, Guildford GU2 7XH, United Kingdom;2. Université de Toulouse, INPT, UPS, Laboratoire de Génie Chimique, 4, Allée Emile Monso, F-31030 Toulouse, France;3. CNRS, Laboratoire de Génie Chimique, F-31030 Toulouse, France;4. Positron Imaging Centre, School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom;1. Department of Materials Science and Engineering, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA;2. National Energy Technology Laboratory, Pittsburgh, PA 15236, USA;3. Leidos Research Support Team, Pittsburgh, PA 15236-0940, USA
Abstract:Within the framework of the two-fluid approach, gas was treated with a large-eddy simulation and a sub-grid-scale (SGS) turbulent kinetic energy model while particles were treated with a second-order-moment method to describe the anisotropy of the fluctuating velocity. A modified Simonin model was derived for the gas–solid interphase fluctuating energy transfer. The anisotropic gas–solid flow in a circulating fluidized bed was investigated. Predictions were in good agreement with experimental data. The distributions of the second-order moment of particles and SGS-turbulent kinetic energy of gas were simulated at different solid mass fluxes. The effects of the solid mass flux on the particle second-order moment, particle anisotropic behavior, gas SGS-turbulent kinetic energy and gas SGS energy dissipation were analyzed for the circulating fluidized bed.
Keywords:Large-eddy simulation  Sub-grid scale turbulent kinetic energy model  Second-order moment model  Anisotropic gas–solid flow  Circulating fluidized bed
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