Impact of impeller modelling approaches on SBES simulations of flow and residence time in a draft tube reactor

Gary J. Brown, David F. Fletcher, Jeremy W. Leggoe, David S. Whyte

Research output: Contribution to journalArticlepeer-review

Abstract

Predictions for flow and residence time in a draft tube reactor were investigated using momentum source, Multiple Reference Frame (MRF) and sliding mesh approaches together with the Stress Blended Eddy Simulation (SBES) turbulence model. Predictions of mean and fluctuating velocities in the annulus, and the exit residence time distribution, are found to be similar and in close agreement with experimental data with all impeller modelling approaches, confirming that the flow in the bulk of the vessel is dominated by the turbulence generated at the draft tube exit and is relatively insensitive to the small-scale turbulence generated by the impeller. On consideration of both accuracy and computational cost, momentum source and MRF approaches offer significant advantages for industrial simulation in this geometry. The SBES model is found to work well in a complex internal flow geometry with an impeller, negating the need for simplifications like zonal LES approaches.

Original languageEnglish
Pages (from-to)157-163
Number of pages7
JournalChemical Engineering Research and Design
Volume178
DOIs
Publication statusPublished - Feb 2022

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