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Hydrodynamic CFD-DEM model validation in a gas-solid vortex unit
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DOI：10.1016/j.cej.2022.140529.png)
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Abstract
En 中文
Process intensification in gas-solid fluidization processes can be achieved by working in a centrifugal rather than a gravitational field. In this regard, the gas-solid vortex unit (GSVU) is an ideal candidate for heterogeneously catalyzed processes. A four-way coupled CFD-DEM model describing the hydrodynamics in the GSVU with an unprecedented level of detail is validated using 2D particle image velocimetry (PIV) experimental data on both azimuthal and radial particle velocity components. It captures high and low velocity regions, both qualitatively and quantitatively. Gas-solid slip velocities several times higher than those obtainable in a gravitational field are achieved, greatly enhancing heat and mass transfer rates. Furthermore, the gas-phase residence time distribution in the GSVU is shown to be narrow. This developed model presents a powerful tool for a better understanding and a detailed design aimed at enhancing the non-reactive and reactive process intensification capabilities of the gas-solid vortex technology.
Keywords:
Process intensification
CFD-DEM
Model validation
Fluidization
Vortex