Hydrodynamics and gas transfer performance of confined hollow fibre membrane modules with the aid of computational fluid dynamics

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Title: Hydrodynamics and gas transfer performance of confined hollow fibre membrane modules with the aid of computational fluid dynamics
Authors: Kavousi, Fatemeh
Syron, Eoin
Semmens, Michael J.
Casey, Eoin
Permanent link: http://hdl.handle.net/10197/8247
Date: 1-Sep-2016
Abstract: The use of gas permeable membranes for bubbleless aeration is of increasing interest due to the energy savings it affords in wastewater treatment applications. However, flow maldistributions are a major factor in the impedance of mass transfer efficiency. In this study, the effect of module configuration on the hydrodynamic conditions and gas transfer properties of various submerged hollow fibre bundles was investigated. Flow patterns and velocity profiles within fibre bundles were predicted numerically using computational fluid dynamics (CFD) and the model was validated by tracer-response experiments. In addition, the effect of fibre spacing and bundle size on the aeration rate of various modules was evaluated experimentally. Previous studies typically base performance evaluations on the liquid inlet velocity or an average velocity, an approach which neglects the effect of geometric features within modules. The use of validated CFD simulations provides more detailed information for performance assessment. It was shown that specific oxygen transfer rates declines significantly with increasing numbers of fibres in a bundle. However, the same trend was not observed when the fibre spacing is increased. A correlation was proposed for the prediction of the overall mass transfer coefficient utilizing the local velocity values obtained from the validated CFD model.
Funding Details: Irish Research Council
Type of material: Journal Article
Publisher: Elsevier
Copyright (published version): 2016 Elsevier
Keywords: Membrane aeration;Computational fluid dynamics (CFD);Hollow fibre module configuration;Mass transfer efficiency;Hydrodynamics
DOI: 10.1016/j.memsci.2016.04.038
Language: en
Status of Item: Peer reviewed
Appears in Collections:Chemical and Bioprocess Engineering Research Collection

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