Numerical Simulation for the Collision of a Vortex Ring With Solid Particles

Abstract

This study is concerned with the numerical simulation of the collision between a vortex ring and an ensemble of small glass particles. The vortex ring, convecting with the self-induced velocity in a quiescent air, collides with the particles. The Reynolds number for the vortex ring is 2600, and the particle diameters are 50 and 200μm. Immediately after the collision with the vortex ring, the 50μm particles surround the vortex ring, forming a dome. The 200μm particles disperse more due to the collision with the vortex ring. This is attributable to the centrifugal effect of the large-scale eddy. The collision between the vortex ring and the particles induces an organized three-dimensional vortical structure inside the vortex ring. It also reduces the strength of vortex ring and the convective velocity.