A numerical study on dispersion of particles from the surface of a circular cylinder placed in a gas flow using discrete vortex method

• Published in: Journal of hydrodynamics. Series B Vol. 26; no. 3; pp. 384 - 393
• Main Author: 黄远东 何文荣 吴文权 KIM Chang-Nyung
• Format: Journal Article
• Language: English
• Published: Singapore Elsevier Ltd 01.07.2014; Springer Singapore; College of Engineering, Kyung Hee University, Yongin 449-701, Korea
• Subjects: circular cylinder; Computational fluid dynamics; Cylinders; discrete vortex method (DVM); Dispersions; Engineering; Engineering Fluid Dynamics; Fluid flow; gas flow; Hydrology/Water Resources; Mathematical models; Numerical and Computational Physics; particle dispersion; Simulation; Stokes number; Vortices; wake vortex; Wakes; 分散液; 固体颗粒; 圆筒; 放置; 数值研究; 离散涡方法; 粒子追踪; 表面; particle dispersion; gas flow; wake vortex; discrete vortex method (DVM); circular cylinder; discrete vortex method(DVM)
• ISSN: 1001-6058; 1878-0342
• DOI: 10.1016/S1001-6058(14)60043-3

The dispersion of particles emitted from the surface of a circular cylinder placed in a gas flow at the Reynolds number of 200 000 is numerically investigated using the discrete vortex method coupled with a Lagrangian approach for solid particle tracking. The wake vortex patterns, the temporal-spatial distributions and trajectories as well as the dispersion functions for particles with various Stokes numbers（St） ranging from 0.001 to 1.0 are obtained. The numerical results reveal that：（1） Solid particles on the cylinder surface are picked up and then transported away from the cylinder by the wake vortex flow.（2） Solid particles emitted from the cylinder surface always follow the vortices in the cylinder wake, and the response of particles to wake vortices is directly related to their Stokes numbers（particles with St= 0.001, 0.0038, 0.01 can distribute both in the vortex core and around the vortex periphery, whereas those with St= 0.1, 1.0 can not enter the vortex core and congregate mainly around the vortex periphery）.（3） The particles move in rolling state in the wake region, and the dispersion intensity of particles in the lateral direction decreases remarkably as the Stokes number of particles is increased from 0.001 to 1.0.