Pore cross-talk in colloidal filtration

Abstract : Blockage of pores by particles is found in numerous industrial and natural processes, including filtration and oil extraction. We present experimental results of filtration through a linear array of ten channels with one dimension which is sub-micron. These silicon-glass nanoslits serve as model pores, through which a dilute dispersion of Brownian polystyrene spheres flows. The clog growth rate at fixed differential pressure is shown to systematically increase with the number of saturated (entirely clogged) pores, indicating that there is an interaction or " cross-talk " between the pores. This observation is interpreted using a model proposed here, based on the concept that the residual permeability allows a clog to act as a filter. A clogged pore is thus the source of a local increase of particle concentration adjacent to the pore, which then diffuses towards other pores. This phenomenon, evidenced and modelled here in one dimension, should be at play in two-dimensional membranes.
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Contributor : Olivier Liot <>
Submitted on : Wednesday, November 29, 2017 - 3:34:43 PM
Last modification on : Thursday, January 11, 2018 - 6:28:06 AM

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Olivier Liot, Akash Singh, Patrice Bacchin, Paul Duru, Jeffrey Morris, et al.. Pore cross-talk in colloidal filtration. Rapport LAAS n° 17438. 2017. 〈hal-01651843〉

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