CLOGGING OF MODEL PORES WITH BROWNIAN PARTICLES

Abstract : Pore clogging with Brownian particles is of wide interest in filtration processes. We perform experiments where model sub-micrometric pores are clogged using a Brownian suspension. We study the influence of the ionic strength on the clog formation dynamics. The erosion/drag force competition is also studied using a crossflow in the inlet channel. The way the clogs disintegrate after the clogging process provides some information about their structure, which can be composed of two or three " layers " – labile or not. INTRODUCTION This paper reports new results about model pores clogging with strongly Brownian particles. The accumulation of particles in a porous media is a complex process which involves DLVO, steric and hydrodynamic interactions. The clogging phenomenon may occur in inkjet printers or numerous other applications such as water filtration through a membrane. While the fouling of a membrane at the macroscopic scale is well understood, the investigations at the pore scale are still at their beginning [1]. Very recent works have used model microchannels to study the effect of different parameters, such as ionic strength or Péclet number (advection/diffusion competition) on the clogging of pores at the micrometer scale [2-4]. The sub-micron dimensions are still unexplored in spite of strong specificities (Brownian motion, system size comparable to scales of interaction), and relevance (0.2 µm being a typical industrial pore size). In this context, we study the clogging/unclogging of silicon-glass channels with Brownian particles. We focus particularly on the influence of ionic strength and the building/erosion processes using a crossflow imposed in the inlet microchannel.
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The 21st International Conference on Miniaturized Systems for Chemistry and Life Sciences (MicroTAS 2017), Oct 2017, Savannah, United States. 2p., 2017
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Soumis le : mercredi 22 novembre 2017 - 09:51:30
Dernière modification le : jeudi 13 septembre 2018 - 14:20:03

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Olivier Liot, Patrice Bacchin, Paul Duru, Pierre Joseph, Jeffrey Morris. CLOGGING OF MODEL PORES WITH BROWNIAN PARTICLES. The 21st International Conference on Miniaturized Systems for Chemistry and Life Sciences (MicroTAS 2017), Oct 2017, Savannah, United States. 2p., 2017. 〈hal-01644282〉

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