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Numerical Modeling of Fluidized Beds Using a New Model for Particle Diffusion inside Dense Two-Phase Flows

DOI: 10.1615/ICHMT.2006.TurbulHeatMassTransf.1450
pages 671-674

R. Groll
Center of Applied Space Technology and Microgravity, University of Bremen, Am Fallturm, D-28359 Bremen, Germany

Abstract

Volume-fraction weighted and Reynolds averaged momentum transport equations are solved in an Euler/Euler approach to simulate numerically the turbulent, dispersed two-phase flow in a two-dimensional channel and a backward-facing step flow. Particular attention is given to the modelling of turbulent diffusion and particle wall interaction, assuming local equilibrium but introducing individual terms for particle/fluid drag interaction, particle collisions and trajectory crossings. These influences have been quantified in terms of partial viscosities, a restitution power and a turbulence structure parameter. Boussinesq approximations have been used for each phase and their interaction, whose formulation was provided in the framework of the eddy-viscosity modelling concept.

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