The effect of incident angle on the rebound behavior of micro-particle impacts

Abstract

Particle deposition exists widely in life and industrial production. The particle-particle or particle-wall impact is the fundamental problem to exact description of particle deposition process. In this paper, the processes of SiO2 micro-particles impacting onto a flat SUS316 stainless steel with different incident angles under different incident velocities were experimentally studied under normal temperature and pressure. The normal and tangential coefficient of restitution is obtained through the experiments. Then the effect of incident angle on the rebound characteristics is studied by using dynamic model. The results show that the critical capture velocity is 0.809 m/s for normal impact. From the perspective of energy loss, particles are more likely to be captured by the surface at a high incidence angle. The dynamic friction coefficient between SiO2 particles impact with the stainless steel surface in present experiments is determined to be 0.435. The measured tangential rebound velocities are also predicted by two different dynamic models in the following work. To better predicting the rebound behaviors of the oblique impact, it is necessary to obtain the relationship of normal restitution coefficient and normal velocity by experiments.