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Multiphase Science and Technology
HYDRODYNAMIC STUDY OF A HOLLOW FIBER MEMBRANE SYSTEM USING EXPERIMENTALLY AND NUMERICALLY DERIVED SURFACE SHEAR STRESSES
University of Los Andes
FlowConcept GmbH, Vahrenwalder Strasse 7, 30165 Hannover, Germany
BIOMATH, Department of Mathematical Modelling, Statistics and Bioinformatics. Ghent University, Coupure Links 653, B-9000, Ghent, Belgium
Computational fluid dynamics (CFD) models can be used to gain insight into the shear stresses induced by air sparging on submerged hollow fiber membrane bioreactor (MBR) systems. It was found that the average range of shear stresses obtained by the CFD model (0.30-0.60 Pa) and experimentally (0.39-0.69 Pa) were in good agreement, with an error less that 15%. Based on comparison of the cumulative frequency distribution of shear stresses from experiments and simulation, (i) moderate shear stresses (i.e., 50th percentile) were found to be accurately predicted (model: 0.24-0.45 Pa; experimental: 0.25-0.49 Pa) with an error of less than 5%; (ii) high shear stress (i.e., 90th percentile) predictions were much less accurate (model: 0.60-1.23 Pa; experimental: 1.04-1.90 Pa) with an error up to 38%. This was attributed to the fact that the CFD model only considers the two-phase flow (50th percentile) and not the movement of fibers. The latter is likely due to shielding effects or fiber sway, significantly affecting shear stresses at the high end of the distribution. However, this was not accounted for in the model in this study. Despite these deviations, the CFD model in its current state can be used to gain insight into the order of magnitude and shear stress distribution. Inclusion of fiber movement is recommended.
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Mixing characterisation of full-scale membrane bioreactors: CFD modelling with experimental validation.
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Distribution of surface shear forces and bubble characteristics in full-scale gas sparged submerged hollow fiber membrane modules.
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Experimental validation of a hydrodynamic CFD model of a hollow fiber MBR using shear intensity measurements.
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An experimental study of the unsteady nature of the viscous sublayer.
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Flow structures in MBR-tanks.
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CFD modelling of gas-sparged ultrafiltration in tubular membranes.
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An aeration energy model for an immersed membrane bioreactor.
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Membrane bioreactors: overview of the effects of module geometry on mixing energy.
Wang, Y., Brannock, M., Cox, S., and Leslie, G.,
CFD simulations of membrane filtration zone in a submerged hollow fibre membrane bioreactor using a porous media approach.