Influence of the Navier boundary wall slip on flow patterns in micro-scale cavity

For the behaviors of micro-fluidics in cavity micro-flow, a CFD numerical simulation is adopted to investigate the slip effects on cavity micro-flow. In addition, a new slip model based on the concept of boundary layer thickness was derived theoretically and tested. It´s found that boundary wall with the Navier slip condition will change the pattern of cavity micro-flow. In the case of pressure driven cavity micro-flow, the slip wall boundary condition will restrain the growth and development of vortex in the cavity. On the lid-shear-driven cavity micro-flow, slip wall boundary condition could change the position and shape of vortex separation line under cavity, yet a stronger degree slip will promote the morphological changes of vortex. Meanwhile the new slip model is more applicable to step-wall boundary condition, which will reveal the process of slip occurrence.