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Time dependence and local structure of tracer dispersion in oscillating liquid Hele-Shaw flows
Physics of Fluids
Passive tracer dispersion in oscillating Poiseuille liquid flows of zero net velocity is studied experimentally in a Hele-Shaw cell and numerically by 2D simulations: this study is particularly focused on the time dependence and local properties of the dispersion. The dispersion mechanism is found to be controlled by the ratio τ m /T of the molecular diffusion time across the gap and the oscillation period (when molecular diffusion parallel to the flow is negligible). The 2D numericaldoi:10.1063/1.4932302 fatcat:bgn763ueqvexvd65nmaudav5xm