Flow past a rotating cylinder at low and high rotation rates / Kumar, S. in Transactions of the ASME . Journal of fluids engineering, Vol. 133 N° 4 (Avril 2011)  

Public ISBD [article]  inTransactions of the ASME . Journal of fluids engineering > Vol. 133 N° 4 (Avril 2011) . - 09 p. Titre : Flow past a rotating cylinder at low and high rotation rates Type de document : texte imprimé Auteurs : Kumar, S., Auteur ; Cantu, C., Auteur ; Gonzalez, B., Auteur Année de publication : 2011 Article en page(s) : 09 p. Note générale : Fluids engineering Langues : Anglais (eng) Mots-clés : Bubbles External flows Flow visualisation Laminar flow Pattern formation Vortices Wakes Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Flow past a rotating circular cylinder is studied experimentally. The experiments are carried out in a water tunnel at Reynolds numbers of 200, 300, and 400 and nondimensional rotation rates (ratio of surface speed of the cylinder to the free stream velocity), alpha, varying from 0 to 5. The diagnostic is done by flow visualization using hydrogen bubble technique and quantitative measurements using a particle image velocimetry technique. We present the global view of the wake structure at the three Reynolds numbers and various rotation rates. Vortex shedding activity is observed to occur from alpha=0 to alpha~1.95, after which it is suppressed. Reynolds number is found to have a strong effect on the wake morphology near the suppression rotation rate, alpha=1.95. Interestingly, the vortex shedding activity again resumes in the range 4.34 DEWEY : 620.1 ISSN : 0742-4795 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JFEGA400013 [...] [article] Flow past a rotating cylinder at low and high rotation rates [texte imprimé] / Kumar, S., Auteur ; Cantu, C., Auteur ; Gonzalez, B., Auteur . - 2011 . - 09 p. Fluids engineering Langues : Anglais (eng) in Transactions of the ASME . Journal of fluids engineering > Vol. 133 N° 4 (Avril 2011) . - 09 p. Mots-clés : Bubbles External flows Flow visualisation Laminar flow Pattern formation Vortices Wakes Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Flow past a rotating circular cylinder is studied experimentally. The experiments are carried out in a water tunnel at Reynolds numbers of 200, 300, and 400 and nondimensional rotation rates (ratio of surface speed of the cylinder to the free stream velocity), alpha, varying from 0 to 5. The diagnostic is done by flow visualization using hydrogen bubble technique and quantitative measurements using a particle image velocimetry technique. We present the global view of the wake structure at the three Reynolds numbers and various rotation rates. Vortex shedding activity is observed to occur from alpha=0 to alpha~1.95, after which it is suppressed. Reynolds number is found to have a strong effect on the wake morphology near the suppression rotation rate, alpha=1.95. Interestingly, the vortex shedding activity again resumes in the range 4.34 DEWEY : 620.1 ISSN : 0742-4795 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JFEGA400013 [...]

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