Modeling of cluster structure-dependent drag with Eulerian approach for circulating fluidized beds |
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Authors: | Wang Shuai Liu Guodong Xu Pengfei |
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Affiliation: | a School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, 150001, Chinab Department of Chemical and Biological Engineering, Illinois Institute of Technology, Chicago, IL 60616, USA |
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Abstract: | Flow behavior of gas and solids is simulated in combination the gas-solid two-fluid model with a cluster structure-dependent (CSD) drag coefficient model. The dispersed phase is modeled by a Eulerian approach based upon the kinetic theory of granular flow (KTGF) including models for describing the dispersed phase interactions with the continuous phase. The drag forces of gas-solid phases are predicted from the local structure parameters of the dense and dilute phases based on the minimization of the energy consumed by heterogeneous drag. The cluster structure-dependent (CSD) drag coefficients are incorporated into the two-fluid model to simulate flow behavior of gas and particles in a riser. Simulation results indicate that the dynamic formation and dissolution of clusters can be captured with the cluster structure-dependent drag coefficient model. Simulated solid velocity and concentration of particles profiles are in reasonable agreement with experimental results. |
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Keywords: | Cluster structure-dependent drag coefficient model Kinetic theory of granular flow Numerical simulation Computational fluid dynamics Riser |
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