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Mechanism of particle transport in a fully developed wake flow / Jun Yao in Industrial & engineering chemistry research, Vol. 51 N° 33 (Août 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 33 (Août 2012) . - pp. 10936-10948 Titre : Mechanism of particle transport in a fully developed wake flow Type de document : texte imprimé Auteurs : Jun Yao, Auteur ; Yanlin Zhao, Auteur ; Ning Li, Auteur Année de publication : 2012 Article en page(s) : pp. 10936-10948 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Wake  Particle  transport Résumé : In this paper, the time-dependent Navier-Stokes equations were integrated in time using a mixed explicit-implicit operator splitting rules. The spatial discretization was processed using the spectral-element method. Nonreflecting conditions were employed at the outflow boundary. Particles were traced by the Lagrangian approach based on one-way coupling between the continuous and the disperse phases. The simulation results of the flow field agree well with experimental data. Particles (St = 4) are found to concentrate in the regions between adjacent vortex structures (RAVS) together with other particles dispersed outside of vortex outlining the boundaries of the large-scale vortex structures, which is independent of the flow Reynolds number. Due to U-velocity component difference, at the entrance of RAVS the flow does "compact" on particles causing particle concentration, and it increases with the flow Reynolds number and particle size. The mechanism of particle transport in the wake flow mostly depends on the strong interactions between two alternative and successive shedding vortex structures with opposite sign. Particle transport in the wake flow could be briefly described as follows: moving around vortices and going ahead with vortices. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26286468 [article] Mechanism of particle transport in a fully developed wake flow [texte imprimé] / Jun Yao, Auteur ; Yanlin Zhao, Auteur ; Ning Li, Auteur . - 2012 . - pp. 10936-10948. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 33 (Août 2012) . - pp. 10936-10948 Mots-clés : Wake  Particle  transport Résumé : In this paper, the time-dependent Navier-Stokes equations were integrated in time using a mixed explicit-implicit operator splitting rules. The spatial discretization was processed using the spectral-element method. Nonreflecting conditions were employed at the outflow boundary. Particles were traced by the Lagrangian approach based on one-way coupling between the continuous and the disperse phases. The simulation results of the flow field agree well with experimental data. Particles (St = 4) are found to concentrate in the regions between adjacent vortex structures (RAVS) together with other particles dispersed outside of vortex outlining the boundaries of the large-scale vortex structures, which is independent of the flow Reynolds number. Due to U-velocity component difference, at the entrance of RAVS the flow does "compact" on particles causing particle concentration, and it increases with the flow Reynolds number and particle size. The mechanism of particle transport in the wake flow mostly depends on the strong interactions between two alternative and successive shedding vortex structures with opposite sign. Particle transport in the wake flow could be briefly described as follows: moving around vortices and going ahead with vortices. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26286468

A Model for direct estimation of wetting phase relative permeabilities using a multistep drainage process / Shengdong Wang in Industrial & engineering chemistry research, Vol. 51 N° 47 (Novembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15472-15483 Titre : A Model for direct estimation of wetting phase relative permeabilities using a multistep drainage process Type de document : texte imprimé Auteurs : Shengdong Wang, Auteur ; Mingzhe Dong, Auteur ; Jun Yao, Auteur Année de publication : 2013 Article en page(s) : pp. 15472-15483 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Permeability  Wetting  Modeling Résumé : A new analytical model has been developed for determining the wetting phase relative permeabilities in a multiple gas―liquid drainage process. The multistep drainage process consists of a series of drainage processes with a tiered pressure-difference profile. With this model, the wetting phase relative permeabilities can be readily obtained through regression of the wetting phase recovery history. The assumptions used in deriving the analytical model are examined by numerical simulations. The agreement between the analytical and the numerical results indicates that these assumptions are reasonable and valid. Numerical simulations and laboratory results demonstrate that this model is effective for direct estimation of the wetting phase relative permeabilities in the multistep drainage process. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679668 [article] A Model for direct estimation of wetting phase relative permeabilities using a multistep drainage process [texte imprimé] / Shengdong Wang, Auteur ; Mingzhe Dong, Auteur ; Jun Yao, Auteur . - 2013 . - pp. 15472-15483. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15472-15483 Mots-clés : Permeability  Wetting  Modeling Résumé : A new analytical model has been developed for determining the wetting phase relative permeabilities in a multiple gas―liquid drainage process. The multistep drainage process consists of a series of drainage processes with a tiered pressure-difference profile. With this model, the wetting phase relative permeabilities can be readily obtained through regression of the wetting phase recovery history. The assumptions used in deriving the analytical model are examined by numerical simulations. The agreement between the analytical and the numerical results indicates that these assumptions are reasonable and valid. Numerical simulations and laboratory results demonstrate that this model is effective for direct estimation of the wetting phase relative permeabilities in the multistep drainage process. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679668