Abstract
The behavior of neutrally buoyant, non-Brownian suspensions subject to square-wave flow oscillations in Hele-Shaw cells is investigated experimentally. The velocity field across the cell gap is determined by tracking particles in a plane parallel to the main flow. The suspension develops an instability characterized by the growth of a transverse velocity component that is periodic along the main flow direction and in time. No influence of inertia on the development of the instability was observed. The characteristic onset time varies as the inverse of the oscillation amplitude with particle volume fraction dependence similar to that of the shear-induced diffusivity across the cell aperture.
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