Amodeling study on particledispersion inwall-bounded turbulent flows

Jian Hung Lin, Keh-Chin Chang

研究成果: Article同行評審

4 引文 斯高帕斯(Scopus)

摘要

Three physicalmechanismswhichmay affect dispersion of particle'smotion in wall-bounded turbulent flows, including the effects of turbulence, wall roughness in particle-wall collisions, and inter-particle collisions, are numerically investigated in this study. Parametric studies with differentwall roughness extents and with different mass loading ratios of particles are performed in fully developed channel flows with the Eulerian-Lagrangian approach. A low-Reynolds-number k-ε turbulence model is applied for the solution of the carrier-flow field, while the deterministic Lagrangian method together with binary-collision hard-sphere model is applied for the solution of particle motion. It is shown that the mechanism of inter-particle collisions should be taken into account in the modeling except for the flows laden with sufficiently low mass loading ratios of particles. Influences of wall roughness on particle dispersion due to particle-wall collisions are found to be considerable in the bounded particleladen flow. Since the investigated particles are associated with large Stokes numbers, i.e., larger than O(1), in the test problem, the effects of turbulence on particle dispersion aremuch less considerable, as expected, in comparison with another two physical mechanisms investigated in the study.

原文English
頁(從 - 到)764-782
頁數19
期刊Advances in Applied Mathematics and Mechanics
6
發行號6
DOIs
出版狀態Published - 2014 一月 1

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Applied Mathematics

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