Shear stress-based modelling of steady state permeate flux in microfiltration enhanced by two-phase flows

Crossflow microfiltration experiments without intensification and with two-phase gas–liquid flow were performed on aqueous titanium dioxide dispersions using an alumina tubular membrane. The influence of gas flow velocity on flux was studied. The empirical model for steady state permeate flux and ca...

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Published inChemical engineering journal (Lausanne, Switzerland : 1996) Vol. 97; no. 2; pp. 257 - 263
Main Authors Pospı́šil, P., Wakeman, R.J., Hodgson, I.O.A., Mikulášek, P.
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 15.02.2004
Elsevier
Subjects
Applied sciences
Chemical engineering
Exact sciences and technology
Gas–liquid two-phase flow
Hydrodynamics of contact apparatus
Membrane separation (reverse osmosis, dialysis...)
Microfiltration
Modelling
Wall shear stress
Gas–liquid two-phase flow
Microfiltration
Modelling
Wall shear stress
Two phase flow
Crossflow filtration
Gas injection
Empirical model
Modeling
Steady state
Dispersion
Air injection
Membrane separation
Tubular membrane
Gas flow
Shear stress
Gas liquid flow
Flow velocity
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Summary:Crossflow microfiltration experiments without intensification and with two-phase gas–liquid flow were performed on aqueous titanium dioxide dispersions using an alumina tubular membrane. The influence of gas flow velocity on flux was studied. The empirical model for steady state permeate flux and cake thickness prediction was developed. The results of experiments show positive effects of constant gas–liquid two-phase flow on the flux. It was found that there are no operating conditions at which air injection has no effect on the permeate flux. From analysis of the experimental results without gas flow, the empirical model based on Darcy’s Law and on mass balance over a membrane module was derived. The model is based on dimensionless numbers regression of all basic operating conditions that influence permeate flux and cake thickness. The results showed good agreement between model prediction and experimental data with gas injection tested on the same apparatus. When the data from a different system (membrane type, membrane material) were taken, the agreement was not so good.
ISSN:1385-8947
1873-3212
DOI:10.1016/j.cej.2003.05.001