Drag law for bidisperse gas-solid suspensions containing equally sized spheres / Xiaolong Yin in Industrial & engineering chemistry research, Vol. 48 N°1 (Janvier 2009)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 48 N°1 (Janvier 2009) . - P. 227-241 Titre : Drag law for bidisperse gas-solid suspensions containing equally sized spheres Type de document : texte imprimé Auteurs : Xiaolong Yin, Éditeur scientifique ; Sankaran Sundaresan, Éditeur scientifique Année de publication : 2009 Article en page(s) : P. 227-241 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Gas−  Solid Hard-sphere fluid Fluid−  particle relative velocities Résumé : In this study, we constructed from lattice-Boltzmann simulations a drag correlation for bidisperse gas−solid suspensions containing equally sized particles that are moving with different velocities relative to the interstitial fluid. Our analysis is limited to flows at low Reynolds numbers and high Stokes numbers, and the microstructure of the suspension is identical to that of a hard-sphere fluid. The Stokes drag forces acting on the two particle species are related to the fluid−particle relative velocities by a friction coefficient matrix, the off-diagonal components of which represent the particle−particle drag due to hydrodynamic interactions and were found to give important contributions to the net drag force. The off-diagonals exhibit a logarithmic dependence on the lubrication cutoff distance, a length scale on which the lubrication force between approaching particles begins to level off. In our simulations, the total particle volume fraction ϕ ranges from 0.1 to 0.4, and the volume fraction ratio ϕ1/ϕ2 ranges from 1:1 to 1:7. The results from these simulations are captured in explicit constitutive models, which can be readily generalized to multicomponent mixtures. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800171p [article] Drag law for bidisperse gas-solid suspensions containing equally sized spheres [texte imprimé] / Xiaolong Yin, Éditeur scientifique ; Sankaran Sundaresan, Éditeur scientifique . - 2009 . - P. 227-241. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°1 (Janvier 2009) . - P. 227-241 Mots-clés : Gas−  Solid Hard-sphere fluid Fluid−  particle relative velocities Résumé : In this study, we constructed from lattice-Boltzmann simulations a drag correlation for bidisperse gas−solid suspensions containing equally sized particles that are moving with different velocities relative to the interstitial fluid. Our analysis is limited to flows at low Reynolds numbers and high Stokes numbers, and the microstructure of the suspension is identical to that of a hard-sphere fluid. The Stokes drag forces acting on the two particle species are related to the fluid−particle relative velocities by a friction coefficient matrix, the off-diagonal components of which represent the particle−particle drag due to hydrodynamic interactions and were found to give important contributions to the net drag force. The off-diagonals exhibit a logarithmic dependence on the lubrication cutoff distance, a length scale on which the lubrication force between approaching particles begins to level off. In our simulations, the total particle volume fraction ϕ ranges from 0.1 to 0.4, and the volume fraction ratio ϕ1/ϕ2 ranges from 1:1 to 1:7. The results from these simulations are captured in explicit constitutive models, which can be readily generalized to multicomponent mixtures. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800171p

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