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Probability Density Function (PDF) Simulation of Turbulent Reactive Gas‐Solid Flow in a Riser
Author(s) -
Vegendla S. N. P.,
Heynderickx G. J.,
Marin G. B.
Publication year - 2009
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.200800553
Subject(s) - reynolds averaged navier–stokes equations , turbulence , mechanics , finite volume method , flow (mathematics) , mass transfer , two phase flow , eulerian path , thermodynamics , chemistry , materials science , physics , mathematics , lagrangian
A hybrid Lagrangian‐Eulerian methodology is developed for the numerical simulation of turbulent reactive gas‐solid flow. The SO 2 ‐NO x Adsorption Process (SNAP) in a riser reactor with dilute gas‐solid flow is taken as a test case. A three‐dimensional time‐dependent simulation is performed. By using the transported composition PDF method [1], modeling of the mean chemical source term and mass transfer terms in the gas‐solid flow model equations is no longer needed. A notional particle‐based Monte‐Carlo algorithm is used to solve the transported composition PDF equations. A Finite‐Volume technique is used to calculate the hydrodynamic fields from the Reynolds Averaged Navier Stokes (RANS) equations combined with the k ‐ϵ turbulence model for the gas phase and the Kinetic Theory of Granular Flow (KTGF) for the solid phase [2]. The newly developed hybrid solution technique is tested with the SNAP chemistry that has a total of 13 scalars (i.e., 5 gas phase components and 8 solid phase species) for which the composition fields of the reactive species are calculated. A good agreement between simulated and experimental gas‐outlet composition of a demonstration unit is obtained.