Experimental Signature of the Pair-Trajectories of Rough Spheres in the Shear-Induced Microstructure in Non-Colloidal Suspensions

International audienceThe shear-induced microstructure in a semi-dilute non-colloidal suspension is studied. A high resolution Pair Distribution Function in the plane of shear is experimentally determined. It is shown to be anisotropic, with a depleted direction close to the velocity axis in the recession quadrant. The influence of roughness on the interaction between particles is quantitatively evidenced. The experimental results compare well with a model from particle pair tra jectories