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Revista de Chimie (Rev. Chim.), Year 2005, Volume 56, Issue 11,





Multiphase Flow Modelling of Three-Phase Fixed Bed Reactors

Abstract:

Fixed bed columns are intensively used as multiphase contactors and reactors in chemical, biochemical, and petrochemical industries. Because of the two-phase through the fixed beds, the performance of multiphase contactors depends on the complex interaction of the interphase mass transfer, thermodynamics and hydrodynamics. Under reaction conditions, the intraparticle mass transfer and reaction kinetics have additional considerable impact on the reactor performance. The intrinsic complexity of multiphase systems leaves numerous issues unsolved and leads to many inconsistencies and questionable approximations, especially in the modelling of multiphase flow. Multiphase flow modelling in fixed beds is a complicated task due to the difficulty incorporating the complex geometry into the flow equations, and the difficulty in accounting for the gas-liquid interactions in the presence of complex fluid-particle (e.g. partial wetting) contacting. This review focuses on recent advances made in the modelling of the hydrodynamics of two-phase downflow and counter-current flow in fixed beds via two-fluid models coupled with slit and double slit phenomenological approximations relating the mutual three phase hydrodynamic interactions. Keywords: two-phase flow, fixed beds, two-fluid model, slit, double slit model drag closures


Issue: 2005, Volume 56, Issue 11
Pages:
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