Analysis of particle dispersion in a turbulent flow considering particle rotation

doi:10.1016/j.cjche.2022.10.002

Abstract

Abstract: Non-spherical particles exist widely in natural and industrial fluid systems and the motions of non-spherical particles are significantly different from that of spherical particles. In this paper, a simplified model of non-spherical particles considering particle drag correction, lift, and rotation was established. Based on the Eulerian-Lagrangian simulation, the dispersion characteristics of spherical and non-spherical particles with different Stokes numbers in a high-speed turbulent jet were analyzed and compared considering the effect of particle rotation. The results show that, the differences in particle dispersion and radial velocity fluctuation between non-spherical particles and spherical particles in the jet are significant, especially when Stokes number is large. Moreover, the effects of different type of forces on the dispersion of non-spherical particles and spherical particles were compared in detail, which revealed that the change of the Magnus force caused by the increase in the angular velocity of non-spherical particles plays a dominant role in the differences of particle dispersion.

Key words: Dispersion, Particle, Particle-laden flows, Particle rotation, Turbulent flow

摘要： Non-spherical particles exist widely in natural and industrial fluid systems and the motions of non-spherical particles are significantly different from that of spherical particles. In this paper, a simplified model of non-spherical particles considering particle drag correction, lift, and rotation was established. Based on the Eulerian-Lagrangian simulation, the dispersion characteristics of spherical and non-spherical particles with different Stokes numbers in a high-speed turbulent jet were analyzed and compared considering the effect of particle rotation. The results show that, the differences in particle dispersion and radial velocity fluctuation between non-spherical particles and spherical particles in the jet are significant, especially when Stokes number is large. Moreover, the effects of different type of forces on the dispersion of non-spherical particles and spherical particles were compared in detail, which revealed that the change of the Magnus force caused by the increase in the angular velocity of non-spherical particles plays a dominant role in the differences of particle dispersion.

关键词: Dispersion, Particle, Particle-laden flows, Particle rotation, Turbulent flow

Wenshi Huang, Yang Zhang, Yuxin Wu, Jingyu Wang, Minmin Zhou. Analysis of particle dispersion in a turbulent flow considering particle rotation[J]. Chinese Journal of Chemical Engineering, 2023, 58(6): 29-39.

Wenshi Huang, Yang Zhang, Yuxin Wu, Jingyu Wang, Minmin Zhou. Analysis of particle dispersion in a turbulent flow considering particle rotation[J]. 中国化学工程学报, 2023, 58(6): 29-39.

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