Generalized criterion for the onset of particle deposition in crossflow microfiltration via DOTM : modeling and experimental validation

The concept of a critical permeation flux for the onset of particle deposition in crossflow microfiltration (CFMF) is well-established. However, the critical flux is known to be a function of process parameters such as the particle size, bulk concentration and crossflow velocity. In the present stud...

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Main Authors: Zamani, Farhad, Wicaksana, Filicia, Taheri, Amir H., Law, Adrian Wing-Keung, Fane, Anthony Gordon, Krantz, William B.
Other Authors: School of Civil and Environmental Engineering
Format: Article
Language:English
Published: 2014
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Online Access:https://hdl.handle.net/10356/104975
http://hdl.handle.net/10220/20324
http://dx.doi.org/10.1016/j.memsci.2014.01.002
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Institution: Nanyang Technological University
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spelling sg-ntu-dr.10356-1049752019-12-06T21:43:54Z Generalized criterion for the onset of particle deposition in crossflow microfiltration via DOTM : modeling and experimental validation Zamani, Farhad Wicaksana, Filicia Taheri, Amir H. Law, Adrian Wing-Keung Fane, Anthony Gordon Krantz, William B. School of Civil and Environmental Engineering Singapore Membrane Technology Centre DRNTU::Engineering::Environmental engineering::Water treatment The concept of a critical permeation flux for the onset of particle deposition in crossflow microfiltration (CFMF) is well-established. However, the critical flux is known to be a function of process parameters such as the particle size, bulk concentration and crossflow velocity. In the present study, the critical modified Peclet number (Pecrit) is explored instead as a generalized criterion for the onset of particle deposition that incorporates the effects of these process parameters as well as the axial position along the membrane. A proper determination of Pecrit requires an accurate prediction of the concentration polarization boundary layer thickness δc and shear-induced diffusion coefficient Ds. The classical Lévêque model is adapted to allow for the effect of the permeation flux on the velocity profile. Moreover, the assumptions of a constant concentration at the membrane surface cw and constant Ds that have been made in prior studies are relaxed in an improved numerical solution to the convective diffusion equation that is used to predict δc and Ds. The critical permeation flux is determined from particle deposition data taken for 6 and 10 μm latex spheres via Direct Observation Through the Membrane (DOTM) characterization. A constant value of Pecrit=4.00±0.08 is found to characterize the effects of particle diameter, bulk concentration and crossflow velocity as well as axial position on the onset of particle deposition. Accepted version 2014-08-18T04:41:35Z 2019-12-06T21:43:54Z 2014-08-18T04:41:35Z 2019-12-06T21:43:54Z 2014 2014 Journal Article Zamani, F., Wicaksana, F., Taheri, A. H., Law, A. W. K., Fane, A. G., & Krantz, W. B. (2014). Generalized criterion for the onset of particle deposition in crossflow microfiltration via DOTM – Modeling and experimental validation. Journal of Membrane Science, 457, 128-138. 0376-7388 https://hdl.handle.net/10356/104975 http://hdl.handle.net/10220/20324 http://dx.doi.org/10.1016/j.memsci.2014.01.002 en Journal of membrane science © 2014 Elsevier B.V. This is the author created version of a work that has been peer reviewed and accepted for publication by Journal of membrane science, Elsevier B.V. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [DOI: http://dx.doi.org/10.1016/j.memsci.2014.01.002]. 28 p. application/pdf
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic DRNTU::Engineering::Environmental engineering::Water treatment
spellingShingle DRNTU::Engineering::Environmental engineering::Water treatment
Zamani, Farhad
Wicaksana, Filicia
Taheri, Amir H.
Law, Adrian Wing-Keung
Fane, Anthony Gordon
Krantz, William B.
Generalized criterion for the onset of particle deposition in crossflow microfiltration via DOTM : modeling and experimental validation
description The concept of a critical permeation flux for the onset of particle deposition in crossflow microfiltration (CFMF) is well-established. However, the critical flux is known to be a function of process parameters such as the particle size, bulk concentration and crossflow velocity. In the present study, the critical modified Peclet number (Pecrit) is explored instead as a generalized criterion for the onset of particle deposition that incorporates the effects of these process parameters as well as the axial position along the membrane. A proper determination of Pecrit requires an accurate prediction of the concentration polarization boundary layer thickness δc and shear-induced diffusion coefficient Ds. The classical Lévêque model is adapted to allow for the effect of the permeation flux on the velocity profile. Moreover, the assumptions of a constant concentration at the membrane surface cw and constant Ds that have been made in prior studies are relaxed in an improved numerical solution to the convective diffusion equation that is used to predict δc and Ds. The critical permeation flux is determined from particle deposition data taken for 6 and 10 μm latex spheres via Direct Observation Through the Membrane (DOTM) characterization. A constant value of Pecrit=4.00±0.08 is found to characterize the effects of particle diameter, bulk concentration and crossflow velocity as well as axial position on the onset of particle deposition.
author2 School of Civil and Environmental Engineering
author_facet School of Civil and Environmental Engineering
Zamani, Farhad
Wicaksana, Filicia
Taheri, Amir H.
Law, Adrian Wing-Keung
Fane, Anthony Gordon
Krantz, William B.
format Article
author Zamani, Farhad
Wicaksana, Filicia
Taheri, Amir H.
Law, Adrian Wing-Keung
Fane, Anthony Gordon
Krantz, William B.
author_sort Zamani, Farhad
title Generalized criterion for the onset of particle deposition in crossflow microfiltration via DOTM : modeling and experimental validation
title_short Generalized criterion for the onset of particle deposition in crossflow microfiltration via DOTM : modeling and experimental validation
title_full Generalized criterion for the onset of particle deposition in crossflow microfiltration via DOTM : modeling and experimental validation
title_fullStr Generalized criterion for the onset of particle deposition in crossflow microfiltration via DOTM : modeling and experimental validation
title_full_unstemmed Generalized criterion for the onset of particle deposition in crossflow microfiltration via DOTM : modeling and experimental validation
title_sort generalized criterion for the onset of particle deposition in crossflow microfiltration via dotm : modeling and experimental validation
publishDate 2014
url https://hdl.handle.net/10356/104975
http://hdl.handle.net/10220/20324
http://dx.doi.org/10.1016/j.memsci.2014.01.002
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