Study on drag reduction mechanism of liquid-infused surface based on LBM

Objectives  In recent years, liquid-infused surface(LIS) as a new proposed surface of drag reduction changing the residual air conserved by the microgrooves of the traditional superhydrophobic surface into lubricant could extremely improve the stability of the drag reduction level. To fully understand the drag reduction regularity of LIS, we mainly study solubility's influence of lubricant on drag reduction. Methods  Based on Lattice Boltzmann Method we simulated this conserving lubricant microstructure with microflow and studied the mechanism of lubricant's dissolved density and shear velocity's influence on slip length. Results  This liquid-infused surface resulted slip phenomenon. There existed a linear relationship between slip length and cohesion force strength among components when lubricant was completely dissolved or hard to dissolve. Conclusions  With larger cohesion force strength among components, lubricant can result more promising drag reduction when lubricant is hard to dissolve. And the shear velocity has little influence on slip length. This property of lubricant is similar to traditional superhydrophobic surface.