title: Interparticle collision mechanism in turbulence.
abstract: Direct numerical simulations of particle-laden homogeneous isotropic turbulence are performed to investigate interparticle collisions in a wide range of Stokes numbers. Dynamics of the particles are described by Stokes drag including particle-particle interactions via hard-sphere collisions, while fluid turbulence is solved using a pseudospectral method. Particular emphasis is placed on interparticle-collision-based conditional statistics of rotation and dissipation rates of the fluid experienced by heavy particles, which provide essential information on the collision process. We also investigate the collision statistics of collision time interval and angle. Based on a Lamb vortex model for a vortex structure, we claim that collision events occur in the edge region for vortical structures in the intermediate-Stokes-number regime, suggesting that the sling effect enhances collision as well as clustering.
authors: Department of Computational Science and Engineering, Yonsei University, Seoul 120-749, South Korea.
authors: Jung-Il
authors: JI
authors: Choi
authors: Department of Mechanical Engineering, Yonsei University, Seoul 120-749, South Korea.
authors: Yongnam
authors: Y
authors: Park
authors: Department of Mechanical Engineering, Yonsei University, Seoul 120-749, South Korea.
authors: Ohjoon
authors: O
authors: Kwon
authors: Department of Computational Science and Engineering, Yonsei University, Seoul 120-749, South Korea.|Department of Mechanical Engineering, Yonsei University, Seoul 120-749, South Korea.
authors: Changhoon
authors: C
authors: Lee