An advanced EMMS scheme for the prediction of drag coefficient under a 1.2 MWth CFBC isothermal flow—Part I: Numerical formulation
A Nikolopoulos, D Papafotiou, N Nikolopoulos… - Chemical Engineering …, 2010 - Elsevier
Range and size increment of industrial applications regarding Circulating Fluidized Bed
(CFB) technology raise numerous design and operating problems. Further insight into the
governing and complex multiphase flow physics regarding CFB operation can be provided
by CFD analysis. However, it has been proven during the recent years that multi-scale
phenomena occurring in CFB reactors cannot be accurately reproduced by conventional
models. Such models are unable to accurately predict the momentum exchange between …
(CFB) technology raise numerous design and operating problems. Further insight into the
governing and complex multiphase flow physics regarding CFB operation can be provided
by CFD analysis. However, it has been proven during the recent years that multi-scale
phenomena occurring in CFB reactors cannot be accurately reproduced by conventional
models. Such models are unable to accurately predict the momentum exchange between …
An advanced EMMS scheme for the prediction of drag coefficient under a 1.2 MWth CFBC isothermal flow—Part II: Numerical implementation
The arithmetic results from the formulation of an EMMS analysis for the calculation of drag
coefficient between the co-existing phases in a CFB riser were implemented in a CFD code
and three dimensional simulations of the isothermal flow of a 1.2 MWth CFBC unit were
performed. Gas and inert material were modeled in an Eulerian fashion. Except from EMMS
scheme, Gidaspow's correlation was also tested for reasons of comparison. Gidaspow's
drag model is based on the assumption of homogeneous conditions inside a control volume …
coefficient between the co-existing phases in a CFB riser were implemented in a CFD code
and three dimensional simulations of the isothermal flow of a 1.2 MWth CFBC unit were
performed. Gas and inert material were modeled in an Eulerian fashion. Except from EMMS
scheme, Gidaspow's correlation was also tested for reasons of comparison. Gidaspow's
drag model is based on the assumption of homogeneous conditions inside a control volume …
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