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Effects of hydraulic jump location on air entrainment in closed conduits / Joshua D. Mortensen in Journal of hydraulic research, Vol. 50 N° 3 (Mai/Juin 2012) 

Public ISBD [article]  in Journal of hydraulic research > Vol. 50 N° 3 (Mai/Juin 2012) . - pp. 298-303 Titre : Effects of hydraulic jump location on air entrainment in closed conduits Type de document : texte imprimé Auteurs : Joshua D. Mortensen, Auteur ; Steven L. Barfuss, Auteur ; Blake P. Tullis, Auteur Année de publication : 2012 Article en page(s) : pp. 298-303 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Air  entrainment  Characteristic  length  Closed  conduit  Hydraulic  jump  Location  effect Résumé : In vented closed conduit conveyance systems, air entrained through hydraulic jumps can be problematic for system operation. While various factors influencing air entrainment have been reported in the literature, no specific attention has been paid to the hydraulic jump location relative to the point of downstream air release. To better understand the effects of jump location on air entrainment, in this study, experiments were conducted in a vented, circular conduit with variable hydraulic jump locations relative to the pipe outlet. When the hydraulic jump was fully contained within the pipe, the air entrainment rate was dependent on the Froude number immediately upstream of the jump but was independent of the jump location within the pipe. The rate of air entrainment significantly increased, however, when the hydraulic jump was not fully contained within the pipe. For this condition, the distance from the toe of the jump to the pipe outlet significantly influences the air entrainment rate. ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/full/10.1080/00221686.2012.670008 [article] Effects of hydraulic jump location on air entrainment in closed conduits [texte imprimé] / Joshua D. Mortensen, Auteur ; Steven L. Barfuss, Auteur ; Blake P. Tullis, Auteur . - 2012 . - pp. 298-303. Hydraulique Langues : Anglais (eng) in Journal of hydraulic research > Vol. 50 N° 3 (Mai/Juin 2012) . - pp. 298-303 Mots-clés : Air  entrainment  Characteristic  length  Closed  conduit  Hydraulic  jump  Location  effect Résumé : In vented closed conduit conveyance systems, air entrained through hydraulic jumps can be problematic for system operation. While various factors influencing air entrainment have been reported in the literature, no specific attention has been paid to the hydraulic jump location relative to the point of downstream air release. To better understand the effects of jump location on air entrainment, in this study, experiments were conducted in a vented, circular conduit with variable hydraulic jump locations relative to the pipe outlet. When the hydraulic jump was fully contained within the pipe, the air entrainment rate was dependent on the Froude number immediately upstream of the jump but was independent of the jump location within the pipe. The rate of air entrainment significantly increased, however, when the hydraulic jump was not fully contained within the pipe. For this condition, the distance from the toe of the jump to the pipe outlet significantly influences the air entrainment rate. ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/full/10.1080/00221686.2012.670008