Reduced-order modeling and design of zero-net mass-flux actuators require an understanding of several fundamental flow mechanisms governing the performance of these devices. One such aspect is the pressure drop due to oscillatory flow through a slot. In this Brief Communication, we use numerical simulations and experiments to examine physics-based scaling laws for the various mechanisms that de...

Particle image velocimetry is applied to the lid-driven flow in a cube to validate the numerical prediction of steady-oscillatory transition at lower than ever observed Reynolds number. Experimental results agree with the numerical simulation demonstrating large amplitude oscillatory motion overlaying the base quasi-two-dimensional flow in the mid-plane. A good agreement in the values of critic...

A dynamical phase transition from reversible to irreversible behavior occurs when particle suspensions are subjected to uniform oscillatory shear, even in the Stokes flow limit. We consider a more general situation with nonuniform strain (e.g., oscillatory channel flow), which is observed to exhibit markedly different dynamics. The onset of irreversibility is delayed, and occurs simultaneously ...