Two local slip modes at the liquid–liquid interface over liquid-infused surfaces

A liquid–liquid interface (LLI) at liquid-infused surfaces (LISs) plays a significant role in promoting slip flow and reducing frictional drag. By employing the transverse many-body dissipative particle dynamics simulations, behavior of local effective flat LLI for shear flows over periodically grooved LISs has been studied. With increasing viscosity ratio between working fluid lubricant fluid, two modes are identified. For small ratio, length remains finite along LLI, while hybrid boundary condition holds large ratios, i.e., is near groove edge unbounded central region LLI. The vortical inside can be enhanced by due to change mode from state one. Moreover, results suggest scenarios variation slippage. with fraction, increases significantly slippage rather insensitive ratio. underlying mechanism relationship different fractions revealed based on modes. These elucidate effect conditions might serve as guide optimal design properties.