Microscopic pumping of viscous liquids with single cavitation bubbles

A cavitation bubble expanding and collapsing near a rigid boundary develops directed jet flow towards the boundary. In case of perforated plate, some passes through plate thus acts as pump transporting liquid from one side to opposite side. The transport is rather complex, time dependent varies with geometric parameters connecting channel. Therefore, we first model for large range then compare regimes experiments using single laser-induced bubbles. simulations are based on Volume-of-Fluid solver in OpenFOAM account surface tension, compressibility viscosity. resulting flux generated velocity channel obtained discussed regards dependence geometry, viscosity stand-off distance plate. general, high rates achieved long cylindrical channels that have similar width produced by bubble. At low distances combined thick plates, an annular inflow creates fast thin jet, also called needle , which approximately magnitude faster significantly thinner than usually encountered microjet. contrast, plates small distances, pumped direction via reverse .