Tingwen Li, Yongmin Zhang
Gas mixing in a tall narrow fluidized bed operated in the slugging fluidization regime is simulated with computational fluid dynamics. This study aims to investigate the influence of various parameters on gas mixing, particularly focusing on the effect of the specularity coefficient for the partial-slip solid-phase wall boundary condition. The findings highlight that careful specification of the solid-phase wall boundary condition is crucial, as variations such as free slip, partial slip, and no-slip can lead to significant differences in gas back mixing. The study also includes an evaluation of axial and radial tracer concentration profiles across different operational conditions, demonstrating good agreement with existing experimental data from the literature. In the second part of the analysis, the tracer backflow fraction and overall gas backflow fraction are assessed alongside axial profiles of cross-sectional averaged tracer concentrations for various flow conditions. The qualitative trends observed are consistent with previously reported experimental findings, underscoring the importance of understanding gas mixing behavior in optimizing gas-solid fluidized bed processes.
@article{ab974f9e-acd2-4bdf-b1e9-d83cc43e1246,
title={Numerical investigation of gas mixing in},
author={Tingwen Li and Yongmin Zhang},
year={2026},
language={en}
}TY - JOUR TI - Numerical investigation of gas mixing in AU - Tingwen Li AU - Yongmin Zhang PY - 2026 LA - en ER -
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