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Aerated flow characteristics of skimming flow over stepped chutes / Masayuki Takahashi in Journal of hydraulic research, Vol. 50 N° 4 (Juillet/Août 2012) 

Public ISBD [article]  in Journal of hydraulic research > Vol. 50 N° 4 (Juillet/Août 2012) . - pp. 427-434 Titre : Aerated flow characteristics of skimming flow over stepped chutes Type de document : texte imprimé Auteurs : Masayuki Takahashi, Auteur ; Iwao Ohtsu, Auteur Année de publication : 2012 Article en page(s) : pp. 427-434 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Aerated  flow  Friction  factor  Skimming  flow  Specific  energy  Stepped  chute Résumé : Stepped chutes effectively dissipate the energy of supercritical flow of steep channels. In general, stepped chute flows are characterized by self-aeration. For their hydraulic design, it is important to know the aerated flow depth, the aerated flow velocity, the air concentration, and the specific energy. Herein, quasi-uniform aerated skimming flow is systematically investigated over a range of chute angles from 19° to 55° for a wide range of step heights and discharges. Air concentration and aerated flow velocity profiles are presented, and the depth-averaged air concentration and the friction factor are determined. The specific energy is determined based on the aerated flow characteristics, revealing the effects of chute angle and step height on the specific energy of aerated skimming flow. This quantity was compared with the conventional specific energy of clear-water flows. ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/full/10.1080/00221686.2012.702859 [article] Aerated flow characteristics of skimming flow over stepped chutes [texte imprimé] / Masayuki Takahashi, Auteur ; Iwao Ohtsu, Auteur . - 2012 . - pp. 427-434. Hydraulique Langues : Anglais (eng) in Journal of hydraulic research > Vol. 50 N° 4 (Juillet/Août 2012) . - pp. 427-434 Mots-clés : Aerated  flow  Friction  factor  Skimming  flow  Specific  energy  Stepped  chute Résumé : Stepped chutes effectively dissipate the energy of supercritical flow of steep channels. In general, stepped chute flows are characterized by self-aeration. For their hydraulic design, it is important to know the aerated flow depth, the aerated flow velocity, the air concentration, and the specific energy. Herein, quasi-uniform aerated skimming flow is systematically investigated over a range of chute angles from 19° to 55° for a wide range of step heights and discharges. Air concentration and aerated flow velocity profiles are presented, and the depth-averaged air concentration and the friction factor are determined. The specific energy is determined based on the aerated flow characteristics, revealing the effects of chute angle and step height on the specific energy of aerated skimming flow. This quantity was compared with the conventional specific energy of clear-water flows. ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/full/10.1080/00221686.2012.702859

Developing flow in skimming flow regime on embankment stepped spillways / Masayuki Takahashi in Journal of hydraulic research, Vol. 50 N° 4 (Juillet/Août 2012) 

Public ISBD [article]  in Journal of hydraulic research > Vol. 50 N° 4 (Juillet/Août 2012) . - pp. 437-439 Titre : Developing flow in skimming flow regime on embankment stepped spillways Type de document : texte imprimé Auteurs : Masayuki Takahashi, Auteur ; Iwao Ohtsu, Auteur Année de publication : 2012 Article en page(s) : pp. 437-439 Note générale : Hydraulique Langues : Anglais (eng) ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/full/10.1080/00221686.2012.704959 [article] Developing flow in skimming flow regime on embankment stepped spillways [texte imprimé] / Masayuki Takahashi, Auteur ; Iwao Ohtsu, Auteur . - 2012 . - pp. 437-439. Hydraulique Langues : Anglais (eng) in Journal of hydraulic research > Vol. 50 N° 4 (Juillet/Août 2012) . - pp. 437-439 ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/full/10.1080/00221686.2012.704959