Experimental Research on Particle-wall Collisions in Viscous Liquids
A physical model experiment is conducted in a water tank to investigate the collision phenomenon between solid particles and pipe walls which may appears in engineering practices such as deep-sea mining and solid slurry transportation.By studying the effects of particle diameter,particle density,particle surface roughness,liquid viscosity,collision velocity on the rebound velocity and trajectory of particles after collision with the wall,the corresponding collision energy dissipation law is explored.The experimental results indicate that when the Stokes number gradually increases from the critical value,the collision recovery coefficient correspondingly increases to the maximum value.The surface roughness and properties of particles have different effects on energy loss.Glass particles have smaller energy loss compared to iron particles,so the collision recovery coefficient is higher.When particles collide obliquely with the wall,the tangential friction force at the collision site converts some of the energy of the particles into the rotational kinetic energy of their rotation,and the recovery coefficient is smaller than the vertical collision recovery coefficient.
solid particlescollisionviscous liquidStokes numbercoefficient of restitution
NETL
NSTL
万方数据
