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Numerical investigation of interaction between spheroid particles in tandem arrangement at moderate reynolds numbers / Nanda Kishore in Industrial & engineering chemistry research, Vol. 51 N° 30 (Août 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 30 (Août 2012) . - pp. 10265-10273 Titre : Numerical investigation of interaction between spheroid particles in tandem arrangement at moderate reynolds numbers Type de document : texte imprimé Auteurs : Nanda Kishore, Auteur Année de publication : 2012 Article en page(s) : pp. 10265-10273 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Reynolds  number  Spheroid Résumé : In this work, effects of the particle aspect ratio (e), the particle Reynolds number (Re), and the interparticle distance (S) on the flow and drag phenomena of Newtonian fluid flow past a series of three spheroid particles are numerically investigated. The governing conservation equations of mass and momentum are solved using commercial software based on computational fluid dynamics. The numerical solver is benchmarked by comparing present results with those available in the literature for the case of tandem spherical particles (e = 1). Further, expensive new results are obtained over the following range of conditions: 1 ≤ Re ≤ 100, 0.25 ≤ e ≤ 2.5, and 2 ≤ S ≤ 6. The recirculation wake interactions are found to be more significant for prolate particles (e > 1) than for spheres (e = 1) followed by oblate spheroids (e < 1). Regardless of values of Re, e, and S, the drag coefficients of leading particles are very close to those of unbounded isolated particles. The drag coefficients of middle and trailing particles are significantly smaller than those of leading particles. For all values of the aspect ratio and the particle Reynolds number, as the value of the interparticle distance increases, the drag coefficients of each individual particle increases. Furthermore, the ratio between the average drag coefficient of tandem particles to the total drag coefficient of single unconfined particles decreases with increasing Reynolds number and/or increasing aspect ratio and/or decreasing interparticle distance. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26201444 [article] Numerical investigation of interaction between spheroid particles in tandem arrangement at moderate reynolds numbers [texte imprimé] / Nanda Kishore, Auteur . - 2012 . - pp. 10265-10273. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 30 (Août 2012) . - pp. 10265-10273 Mots-clés : Reynolds  number  Spheroid Résumé : In this work, effects of the particle aspect ratio (e), the particle Reynolds number (Re), and the interparticle distance (S) on the flow and drag phenomena of Newtonian fluid flow past a series of three spheroid particles are numerically investigated. The governing conservation equations of mass and momentum are solved using commercial software based on computational fluid dynamics. The numerical solver is benchmarked by comparing present results with those available in the literature for the case of tandem spherical particles (e = 1). Further, expensive new results are obtained over the following range of conditions: 1 ≤ Re ≤ 100, 0.25 ≤ e ≤ 2.5, and 2 ≤ S ≤ 6. The recirculation wake interactions are found to be more significant for prolate particles (e > 1) than for spheres (e = 1) followed by oblate spheroids (e < 1). Regardless of values of Re, e, and S, the drag coefficients of leading particles are very close to those of unbounded isolated particles. The drag coefficients of middle and trailing particles are significantly smaller than those of leading particles. For all values of the aspect ratio and the particle Reynolds number, as the value of the interparticle distance increases, the drag coefficients of each individual particle increases. Furthermore, the ratio between the average drag coefficient of tandem particles to the total drag coefficient of single unconfined particles decreases with increasing Reynolds number and/or increasing aspect ratio and/or decreasing interparticle distance. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26201444

Wall effects on flow and drag phenomena of spheroid particles at moderate reynolds numbers / Nanda Kishore in Industrial & engineering chemistry research, Vol. 49 N° 19 (Octobre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 19 (Octobre 2010) . - pp. 9486–9495 Titre : Wall effects on flow and drag phenomena of spheroid particles at moderate reynolds numbers Type de document : texte imprimé Auteurs : Nanda Kishore, Auteur ; Sai Gu, Auteur Année de publication : 2010 Article en page(s) : pp. 9486–9495 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Spheroid  particles Résumé : Two dimensional steady Newtonian flow past oblate and prolate spheroid particles confined in cylindrical tubes of different diameters has been numerically investigated. The flow and drag phenomena of confined spheroid particles are governed by the equations of continuity and conservation of momentum. These equations along with appropriate boundary conditions have been solved using commercial software based on computational fluid dynamics. Extensive new results were obtained on individual and total drag coefficients of spheroid particles, along with streamline contours, distributions of pressure coefficients, and vorticity magnitudes on the surface of spheroid particles as functions of the Reynolds number (Re), the aspect ratio (e), and the wall factor (λ) over the following range of conditions: 1 ≤ Re ≤ 200, 0.25 ≤ e ≤ 2.5, and 2 ≤ λ ≤ 30. For all values of the aspect ratio, as values of the Reynolds numbers and/or the wall factor increase, the length of recirculation wake increases. For fixed values of the aspect ratio and the Reynolds number, the increase in the value of the wall factor decrease both individual and the total drag coefficients. On the whole, regardless of the value of the aspect ratio, the wall effect was found to gradually diminish with the increasing Reynolds number and/or the wall factor. Finally, on the basis of the present numerical results a simple correlation has been proposed for the total drag coefficient of confined spheroid particles which can be used in new applications. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1011189 [article] Wall effects on flow and drag phenomena of spheroid particles at moderate reynolds numbers [texte imprimé] / Nanda Kishore, Auteur ; Sai Gu, Auteur . - 2010 . - pp. 9486–9495. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 19 (Octobre 2010) . - pp. 9486–9495 Mots-clés : Spheroid  particles Résumé : Two dimensional steady Newtonian flow past oblate and prolate spheroid particles confined in cylindrical tubes of different diameters has been numerically investigated. The flow and drag phenomena of confined spheroid particles are governed by the equations of continuity and conservation of momentum. These equations along with appropriate boundary conditions have been solved using commercial software based on computational fluid dynamics. Extensive new results were obtained on individual and total drag coefficients of spheroid particles, along with streamline contours, distributions of pressure coefficients, and vorticity magnitudes on the surface of spheroid particles as functions of the Reynolds number (Re), the aspect ratio (e), and the wall factor (λ) over the following range of conditions: 1 ≤ Re ≤ 200, 0.25 ≤ e ≤ 2.5, and 2 ≤ λ ≤ 30. For all values of the aspect ratio, as values of the Reynolds numbers and/or the wall factor increase, the length of recirculation wake increases. For fixed values of the aspect ratio and the Reynolds number, the increase in the value of the wall factor decrease both individual and the total drag coefficients. On the whole, regardless of the value of the aspect ratio, the wall effect was found to gradually diminish with the increasing Reynolds number and/or the wall factor. Finally, on the basis of the present numerical results a simple correlation has been proposed for the total drag coefficient of confined spheroid particles which can be used in new applications. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1011189

Wall retardation effects on flow and drag phenomena of confined spherical particles in shear-thickening fluids / C. Rajasekhar Reddy in Industrial & engineering chemistry research, Vol. 51 N° 51 (Décembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 51 (Décembre 2012) . - pp.16755–16762 Titre : Wall retardation effects on flow and drag phenomena of confined spherical particles in shear-thickening fluids Type de document : texte imprimé Auteurs : C. Rajasekhar Reddy, Auteur ; Nanda Kishore, Auteur Année de publication : 2012 Article en page(s) : pp.16755–16762 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Spherical  particles Résumé : In this work, effects of the wall retardation, Reynolds number, and shear-thickening viscosity behavior of fluids on flow and drag phenomena of confined spherical particles are presented. The governing mass and momentum conservation equations are solved using computational fluid dynamics-based commercial software. The numerical solver is thoroughly validated by comparing present results with existing literature for the case of unconfined spheres in Newtonian and shear-thickening fluids. Extensive new results were presented in the following range of conditions: Reynolds number, Re, 1–100; wall factor, λ, 2–5; and power-law index, n, 1–1.8. The wall factor (λ) is defined as the ratio between the tube diameter and the particle diameter. The severity of wall retardation effects increases with increasing power-law index. For fixed values of the Reynolds number, the recirculation wake length decreases with decreasing wall factor and/or increasing power-law index. For n = 1.8, the wall retardation effects are very strong so that for λ = 2, there is no recirculation wake behind confined sphere even at Re = 100. Furthermore, regardless of values of the Reynolds number, the total drag coefficient increases with increasing power-law index and/or decreasing wall factor. The effect of the Reynolds number on the ratio between pressure and friction drag coefficients decreases with increasing power-law index and/or increasing wall factor. Finally, on the basis of present numerical results, a correlation is developed for the total drag coefficient of confined spherical particles settling in shear-thickening fluids. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie302707s [article] Wall retardation effects on flow and drag phenomena of confined spherical particles in shear-thickening fluids [texte imprimé] / C. Rajasekhar Reddy, Auteur ; Nanda Kishore, Auteur . - 2012 . - pp.16755–16762. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 51 (Décembre 2012) . - pp.16755–16762 Mots-clés : Spherical  particles Résumé : In this work, effects of the wall retardation, Reynolds number, and shear-thickening viscosity behavior of fluids on flow and drag phenomena of confined spherical particles are presented. The governing mass and momentum conservation equations are solved using computational fluid dynamics-based commercial software. The numerical solver is thoroughly validated by comparing present results with existing literature for the case of unconfined spheres in Newtonian and shear-thickening fluids. Extensive new results were presented in the following range of conditions: Reynolds number, Re, 1–100; wall factor, λ, 2–5; and power-law index, n, 1–1.8. The wall factor (λ) is defined as the ratio between the tube diameter and the particle diameter. The severity of wall retardation effects increases with increasing power-law index. For fixed values of the Reynolds number, the recirculation wake length decreases with decreasing wall factor and/or increasing power-law index. For n = 1.8, the wall retardation effects are very strong so that for λ = 2, there is no recirculation wake behind confined sphere even at Re = 100. Furthermore, regardless of values of the Reynolds number, the total drag coefficient increases with increasing power-law index and/or decreasing wall factor. The effect of the Reynolds number on the ratio between pressure and friction drag coefficients decreases with increasing power-law index and/or increasing wall factor. Finally, on the basis of present numerical results, a correlation is developed for the total drag coefficient of confined spherical particles settling in shear-thickening fluids. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie302707s