Scale-up of solids distribution in slurry, stirred vessels based on turbulence intermittency / G. Montante in Industrial & engineering chemistry research, Vol. 47 N°10 (Mai 2008)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 47 N°10 (Mai 2008) . - p. 3438–3443 Titre : Scale-up of solids distribution in slurry, stirred vessels based on turbulence intermittency Type de document : texte imprimé Auteurs : G. Montante, Auteur ; J. R. Bourne, Auteur ; F. Magelli, Auteur Année de publication : 2008 Article en page(s) : p. 3438–3443 Note générale : Bibliogr. p. 3442-3443 Langues : Anglais (eng) Mots-clés : Scale-up criteria  Stirred vessels  Turbulent fluctuations Résumé : Scale-up criteria for obtaining the same vertical concentration profile of particles in agitated, dilute suspensions are considered. Previous experiments in two sizes of high aspect ratio vessels stirred by multiple impellers (either pitched blade or Rushton turbines) gave n = 0.93 in the scale-up relationship32 NDn = constant. This result is intermediate between constant power per unit volume (n = 2/3) and constant tip speed (n = 1), although closer to the latter. It is now suggested that intermittent turbulent fluctuations greater than their average values play a part in maintaining vertical concentration gradients. An analysis of solids suspension by intermittent turbulence gives n ≈ 0.93. This value is also supported by additional experimental data as well as by new CFD results. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie070339v [article] Scale-up of solids distribution in slurry, stirred vessels based on turbulence intermittency [texte imprimé] / G. Montante, Auteur ; J. R. Bourne, Auteur ; F. Magelli, Auteur . - 2008 . - p. 3438–3443. Bibliogr. p. 3442-3443 Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N°10 (Mai 2008) . - p. 3438–3443 Mots-clés : Scale-up criteria  Stirred vessels  Turbulent fluctuations Résumé : Scale-up criteria for obtaining the same vertical concentration profile of particles in agitated, dilute suspensions are considered. Previous experiments in two sizes of high aspect ratio vessels stirred by multiple impellers (either pitched blade or Rushton turbines) gave n = 0.93 in the scale-up relationship32 NDn = constant. This result is intermediate between constant power per unit volume (n = 2/3) and constant tip speed (n = 1), although closer to the latter. It is now suggested that intermittent turbulent fluctuations greater than their average values play a part in maintaining vertical concentration gradients. An analysis of solids suspension by intermittent turbulence gives n ≈ 0.93. This value is also supported by additional experimental data as well as by new CFD results. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie070339v

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