Abstract:

Dense suspensions are known for their ability to resist flow due to interactionsbetween particles. For instance, attractive interactions favor the emergence of ayieldstress, while frictional particles can exhibit shear-thickening, i.e., a drasticincrease in viscosity.In confined geometries, interparticle friction and/or adhesiorlead to the formation of clogs. By considering frictionless, non-adhesive particles inthe absence of attractive interactions, we isolate the influence of particle geometry onthe clogging of a dense suspension flowing through a constriction. In particular, shapenon-convexities enable interlocking between particles, which can strongly affect theprobability of clog formation. Here, we experimentally investigate model interlockincparticles by studying the flow of a dense suspension of gear-shaped particles in a 2Dmicrofluidic hopper.By measuring the average number of particles escaping thechannel before a clog forms, we quantify the interplay between particle geometry ancsuspension fow.Our results demonstrate the competition between the ease ofinterlocking and the strenath of the resulting interlocked contacts.

Introduction of speaker:

Philippe Bourrianne is an Associate Professor in PMMH at ESPCl Paris - PSL (France)His research focuses on the flow of complex fluids at the crossroads between sof!matter, fluid mechanics and the physics of interfaces. He is interested in experimentaapproaches in the fields of biophysics, complex suspensions and microfluidics.

审核：刘有晟、游小清