Effect of surface roughness on capillary force during particle-wall impaction under different humidity conditions

Surface roughness is the key factor to influence the normal restitution coefficient between particle-wall collision. In addition, surface roughness will reduce the formation of liquid bridge under humid conditions which are strongly related to the value of the capillary force. In this study, both experimental and theoretical analysis are presented to explore the effect of surface roughness on the process of particle-wall collision under...