Documents disponibles écrits par cet auteur

Cavitation inception in the wake of a jet-driven body / R. E. A. Arndt in Transactions of the ASME . Journal of fluids engineering, Vol. 131 N° 11 (Novembre 2009) 

Public ISBD [article]  in Transactions of the ASME . Journal of fluids engineering > Vol. 131 N° 11 (Novembre 2009) . - 08 p. Titre : Cavitation inception in the wake of a jet-driven body Type de document : texte imprimé Auteurs : R. E. A. Arndt, Auteur ; Eduard L. Amromin, Auteur ; William Hambleton, Auteur Année de publication : 2010 Article en page(s) : 08 p. Note générale : fluids engineering Langues : Anglais (eng) Mots-clés : cavitation  inception;  jet  flow;  body  driven Résumé : Although cavitation inception in jets has been studied extensively, little is known about the more complex problem of a jet flow interacting with an outer flow behind a moving body. This problem is studied experimentally by considering inception behind an axisymmetric body driven by a waterjet. Tests were carried out for various water tunnel velocities and jet speeds such that jet velocity ratio UJ/U could be varied in the range of 0–2. Distinctly different cavitation patterns were observed at zero jet velocity (when cavitation appeared in spiral vortices in such flows) and at various jet velocity ratios (when cavitation appeared around the jet in such flows). A simple superposition analysis, utilizing particle imaging velocimetry (PIV) measurements, is able to qualitatively predict the experimental result. On the basis of these observations, a numerical prediction of cavitation inception number based on viscous-inviscid interaction concept is suggested. En ligne : http://fluidsengineering.asmedigitalcollection.asme.org/issue.aspx?journalid=122 [...] [article] Cavitation inception in the wake of a jet-driven body [texte imprimé] / R. E. A. Arndt, Auteur ; Eduard L. Amromin, Auteur ; William Hambleton, Auteur . - 2010 . - 08 p. fluids engineering Langues : Anglais (eng) in Transactions of the ASME . Journal of fluids engineering > Vol. 131 N° 11 (Novembre 2009) . - 08 p. Mots-clés : cavitation  inception;  jet  flow;  body  driven Résumé : Although cavitation inception in jets has been studied extensively, little is known about the more complex problem of a jet flow interacting with an outer flow behind a moving body. This problem is studied experimentally by considering inception behind an axisymmetric body driven by a waterjet. Tests were carried out for various water tunnel velocities and jet speeds such that jet velocity ratio UJ/U could be varied in the range of 0–2. Distinctly different cavitation patterns were observed at zero jet velocity (when cavitation appeared in spiral vortices in such flows) and at various jet velocity ratios (when cavitation appeared around the jet in such flows). A simple superposition analysis, utilizing particle imaging velocimetry (PIV) measurements, is able to qualitatively predict the experimental result. On the basis of these observations, a numerical prediction of cavitation inception number based on viscous-inviscid interaction concept is suggested. En ligne : http://fluidsengineering.asmedigitalcollection.asme.org/issue.aspx?journalid=122 [...]

Creation and maintenance of cavities under horizontal surfaces in steady and gust flows / R. E. A. Arndt in Transactions of the ASME . Journal of fluids engineering, Vol. 131 N° 11 (Novembre 2009) 

Public ISBD [article]  in Transactions of the ASME . Journal of fluids engineering > Vol. 131 N° 11 (Novembre 2009) . - 10 p. Titre : Creation and maintenance of cavities under horizontal surfaces in steady and gust flows Type de document : texte imprimé Auteurs : R. E. A. Arndt, Auteur ; Amromin, E. L., Auteur ; W. T. Hambleton, Auteur Année de publication : 2010 Article en page(s) : 10 p. Note générale : fluids engineering Langues : Anglais (eng) Mots-clés : air  supply;  horizontal  surface;  gust  flows;  cavitation Résumé : An experimental study of air supply to bottom cavities stabilized within a recess under a horizontal surface has been carried out in a specially designed water tunnel. The air supply necessary for creating and maintaining an air cavity in steady and gust flows has been determined over a wide range of speed. Flux-free ventilated cavitation at low flow speeds has been observed. Stable multiwave cavity forms at subcritical values of Froude number were also observed. It was found that the cross-sectional area of the air supply ducting has a substantial effect on the air demand. Air supply scaling laws were deduced and verified with the experimental data obtained. En ligne : http://fluidsengineering.asmedigitalcollection.asme.org/issue.aspx?journalid=122 [...] [article] Creation and maintenance of cavities under horizontal surfaces in steady and gust flows [texte imprimé] / R. E. A. Arndt, Auteur ; Amromin, E. L., Auteur ; W. T. Hambleton, Auteur . - 2010 . - 10 p. fluids engineering Langues : Anglais (eng) in Transactions of the ASME . Journal of fluids engineering > Vol. 131 N° 11 (Novembre 2009) . - 10 p. Mots-clés : air  supply;  horizontal  surface;  gust  flows;  cavitation Résumé : An experimental study of air supply to bottom cavities stabilized within a recess under a horizontal surface has been carried out in a specially designed water tunnel. The air supply necessary for creating and maintaining an air cavity in steady and gust flows has been determined over a wide range of speed. Flux-free ventilated cavitation at low flow speeds has been observed. Stable multiwave cavity forms at subcritical values of Froude number were also observed. It was found that the cross-sectional area of the air supply ducting has a substantial effect on the air demand. Air supply scaling laws were deduced and verified with the experimental data obtained. En ligne : http://fluidsengineering.asmedigitalcollection.asme.org/issue.aspx?journalid=122 [...]