Striped patterns in radially driven suspensions with open boundaries

We study the motion of radially driven fluid-immersed particles in a novel Hele-Shaw cell with open boundaries. The initially uniform suspension forms striped pattern within specific range horizontal oscillation frequencies and for sufficiently large amplitudes. observe that initial coarsening dynamics stripes gradually slows down reaches steady state after few minutes. distance between exhibits an exponentially saturating increase increased amplitude or frequency. width decreases as power-law frequency while its dependence follows logistic function. propose mechanism -- based on interplay shear stress, hydrodynamic interactions, frictional forces to link structural characteristics properties oscillatory external drive.