Assessing the mixing effectiveness of dual-impeller systems in the agitation of viscoplastic fluids - Laboratoire d'Informatique pour la Mécanique et les Sciences de l'Ingénieur Accéder directement au contenu
Pré-Publication, Document De Travail Année : 2020

Assessing the mixing effectiveness of dual-impeller systems in the agitation of viscoplastic fluids

Andrew W Russell
  • Fonction : Auteur
Lyes Kahouadji
  • Fonction : Auteur
Seungwon Shin
Jalel Chergui
Patrick M. Piccione
  • Fonction : Auteur
Omar K. Matar
Paul F Luckham
  • Fonction : Auteur
Christos N. Markides
  • Fonction : Auteur

Résumé

Dye visualisation techniques and CFD are employed to examine the flow of viscoplastic Carbopol TM 980 fluids, agitated with dual-impeller systems comprising various combinations of Rushton turbine (RT) and pitched blade turbine (PBT) impellers. The effects of impeller configurations and arrangements on the flows are investigated. Phenomena including mixing, 'cavern'-'cavern' segregation, and flow compartmentalisation are explained by considering the dynamics of the velocity fields and associated flow patterns. Dual-RT agitation induces highly symmetrical flows and dependent on the impeller separation, produces strong, time-dependent flow compartmentalisation. Flow compartmentalisation is overcome in comparable dual-PBT systems due the downward-pumping nature of the PBT producing a state of full-tank homogeneity through a cavern engulfment process. The quality of mixing is compared with mixing effectiveness being maximised for a configuration featuring PBT overlying RT impellers. These results demonstrate clearly the influence of the impeller geometrical arrangement on the mixing effectiveness of viscoplastic fluids in dual-impeller systems.
Fichier principal
Vignette du fichier
Russelletal_Manuscript_CES_2019.pdf (1.82 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-02993615 , version 1 (06-11-2020)

Identifiants

  • HAL Id : hal-02993615 , version 1

Citer

Andrew W Russell, Lyes Kahouadji, Seungwon Shin, Jalel Chergui, Damir Juric, et al.. Assessing the mixing effectiveness of dual-impeller systems in the agitation of viscoplastic fluids. 2020. ⟨hal-02993615⟩
176 Consultations
392 Téléchargements

Partager

Gmail Facebook X LinkedIn More