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Confined swirling flows of aqueous surfactant solutions due to a rotating disk in a cylindrical casing / Shinji Tamano in Transactions of the ASME . Journal of fluids engineering, Vol. 130 N° 8 (Août 2008) 

Public ISBD [article]  in Transactions of the ASME . Journal of fluids engineering > Vol. 130 N° 8 (Août 2008) . - 9 p. Titre : Confined swirling flows of aqueous surfactant solutions due to a rotating disk in a cylindrical casing Type de document : texte imprimé Auteurs : Shinji Tamano, Auteur ; Motoyuki Itoh, Auteur ; Mitsunori Yoshida, Auteur Année de publication : 2009 Article en page(s) : 9 p. Note générale : Fluids engineering Langues : Anglais (eng) Mots-clés : Flow  (dynamics);  elasticity;  fluids;  scillations;  Reynolds  number;  flow  visualization;  rotating  disks;  surfactants;  wirling  flow;  Laser  Doppler  anemometry;  rotation;  viscosity;  shear  (mechanics);  light  trucks Résumé : In this study, confined swirling flows of an aqueous surfactant solution due to a rotating disk in a cylindrical casing were investigated using a sectional flow visualization technique and a two-component laser Doppler velocimetry system. The concentrations of aqueous surfactant solutions (C14TASal) are 0.4wt%, 0.8wt%, and 1.2wt%. Rheological properties such as shear viscosity and first normal stress difference of the surfactant solution were measured with a rheometer. The patterns of secondary flow were classified using the Reynolds and elasticity numbers. We revealed that the projection formed near the center of the rotating disk moved up and down at a constant frequency for C14TASal0.8wt% and 1.2wt%, which has not been reported as far as we know. The effects of the Reynolds number, elasticity number, and aspect ratio on the velocity profiles were clarified. It was also found that the region of rigid body rotation existed at the higher Reynolds number tested for C14TASal0.4wt%. En ligne : http://fluidsengineering.asmedigitalcollection.asme.org/issue.aspx?journalid=122 [...] [article] Confined swirling flows of aqueous surfactant solutions due to a rotating disk in a cylindrical casing [texte imprimé] / Shinji Tamano, Auteur ; Motoyuki Itoh, Auteur ; Mitsunori Yoshida, Auteur . - 2009 . - 9 p. Fluids engineering Langues : Anglais (eng) in Transactions of the ASME . Journal of fluids engineering > Vol. 130 N° 8 (Août 2008) . - 9 p. Mots-clés : Flow  (dynamics);  elasticity;  fluids;  scillations;  Reynolds  number;  flow  visualization;  rotating  disks;  surfactants;  wirling  flow;  Laser  Doppler  anemometry;  rotation;  viscosity;  shear  (mechanics);  light  trucks Résumé : In this study, confined swirling flows of an aqueous surfactant solution due to a rotating disk in a cylindrical casing were investigated using a sectional flow visualization technique and a two-component laser Doppler velocimetry system. The concentrations of aqueous surfactant solutions (C14TASal) are 0.4wt%, 0.8wt%, and 1.2wt%. Rheological properties such as shear viscosity and first normal stress difference of the surfactant solution were measured with a rheometer. The patterns of secondary flow were classified using the Reynolds and elasticity numbers. We revealed that the projection formed near the center of the rotating disk moved up and down at a constant frequency for C14TASal0.8wt% and 1.2wt%, which has not been reported as far as we know. The effects of the Reynolds number, elasticity number, and aspect ratio on the velocity profiles were clarified. It was also found that the region of rigid body rotation existed at the higher Reynolds number tested for C14TASal0.4wt%. En ligne : http://fluidsengineering.asmedigitalcollection.asme.org/issue.aspx?journalid=122 [...]