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Un-baffled mixing chemical reactors
Un-baffled mixing chemical reactors
- Context
Precipitation is encountered in a wide range of energy related procedures
They are infinitely fast irreversible chemical reactions
Influenced significantly by the hydrodynamics and the turbulence
Leads to the formation of solid particles (crystals) with various properties
CFD models are required to prevent waste treatment rising from experiments
Research activity
Research activity
- Hydrodynamics validations
Un-baffled stirred tank (industrial configuration)
Large Eddy Simulations (LES) with a highly resolved quality
Two phase flow modelling with a Discontinuous Front Tracking (DFT) method
Different stirring frequencies leading a to highly anisotropic turbulence in the tank
Presence of two zones of vortices that control the flow
- Precipitation reaction LES modelling
Simple fast irreversible reaction of type A + B -> C
Rate of mixing which is controlled by the turbulence and the micro-mixing
Finite-rate combustion model
Eddy Dissipation Concept (EDC) based models
Macro-mixing zones introduced by the vortices zones
- Contributions
Comparisons versus Laser Doppler Velocimetry (LDV) measurements are provided (CEA confidential experiments)
Reference non-dimensional data are obtained concerning the hydrodynamics and influence of reaction rate formulation
Collaborators
Collaborators
- CEA
Guillaume Bois, Maria Giovanna Rodio, Ulrich Bieder, Murielle Bertrand, Nikos Letterier, Yann Dolias
LES calculation
LES calculation
TRUST-TrioCFD, 3.5M tetras
112 MPI procs, OCCIGEN cluster of CINES, France
WALE LES Sub-Grid Scale model
EDC based reaction model
Time averaged iso-surfaces of Q-criterion colored by the vertical velocity component with two different stirring frequencies
A 3D view of the reactor illustrating the confined/diluted product formed with two stirring frequencies and two different reagents injection positions
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