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论文类型：期刊论文

发表时间：2018-05-01

发表刊物：ASIA-PACIFIC JOURNAL OF CHEMICAL ENGINEERING

收录刊物：SCIE

卷号：13

期号：3

ISSN号：1932-2135

关键字：anisotropic particle dispersions; dense particle-laden flows; drag force coefficient; numerical simulation

摘要：Traditional drag force coefficient with regard to modeling gas-particle flows is generally established on the semiempirical or full empirical measurement data with isotropic hypothesis resulting in neglection of true particle dispersions, especially for anisotropic characteristics. A developed drag force coefficient to fully consider the anisotropics was applied to model and simulate dense particle-laden flows. Coupled with a unified second-order moment, 2-fluid turbulent model consisting of a set of fluctuation velocity Reynolds transport equations was employed for predicting dense particle-laden flows in pseudo-2D horizontal chamber. Simulated results showed that they are in good agreement with measurement data. Particle Reynolds stresses have been redistributed by the momentum transfer interaction term between gas and particle phases, the turbulent diffusion term, and the particle collision term. Compared with traditional Wen's model, horizontal and vertical root-mean-square of particle velocities exhibited much more flatter and wider distribution behaviors. Due to limitation of two-dimensional model and wall conditions, errors near wall regions should be improved in future work.