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Fluid dynamic numerical simulation of a gas phase polymerization reactor
Author(s) -
Gobin Anne,
Neau Hervé,
Simonin Olivier,
Llinas JeanRichard,
Reiling Vince,
Sélo JeanLof̈c
Publication year - 2003
Publication title -
international journal for numerical methods in fluids
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 112
eISSN - 1097-0363
pISSN - 0271-2091
DOI - 10.1002/fld.542
Subject(s) - mechanics , pressure drop , particle (ecology) , computer simulation , fluidized bed , computational fluid dynamics , flow (mathematics) , two fluid model , materials science , thermodynamics , simulation , mechanical engineering , physics , engineering , geology , oceanography
This article presents preliminary fluid dynamic simulation results of ethylene polymerization dense fluidized bed using the two‐phase flow numerical code ESTET‐ASTRID developed by Electricité de France for CFB boilers and based on the two‐fluid modelling approach. The continuous phase consists of gas and the dispersed phase consists of catalyst particles. The particle fluctuating motion is modelled using two‐separate transport equations, on the particle kinetic energy and the fluid–particle covariance, developed in the frame of kinetic theory of granular medium accounting for particle–particle and fluid–particle interactions. Time‐dependent 2D and 3D simulations have been performed for industrial and pilot reactor operating conditions. The numerical predictions are in good qualitative agreement with the observed behaviour in terms of bed height, pressure drop and mean flow organization, such as the down falling of the PE particle layer along the walls. Moreover, these simulations help to provide information about instantaneous and time‐averaged solid concentration and velocity fields. Characteristic mechanisms and influence of model closure assumptions on flow predictions are also investigated. Finally, such numerical simulations look very powerful, when validated on exhaustive data collection, to improve design and performance of industrial facilities and to provide insight into the complex physical mechanisms involved. Copyright © 2003 John Wiley & Sons, Ltd.