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Discharge coefficients for free and submerged flow over Piano Key weirs / Abdorreza Kabiri-Samani in Journal of hydraulic research, Vol. 50 N° 1 (Janvier/Février 2012) 

Public ISBD [article]  in Journal of hydraulic research > Vol. 50 N° 1 (Janvier/Février 2012) . - pp. 114-120 Titre : Discharge coefficients for free and submerged flow over Piano Key weirs Type de document : texte imprimé Auteurs : Abdorreza Kabiri-Samani, Auteur ; Amir Javaheri, Auteur Année de publication : 2012 Article en page(s) : pp. 114-120 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Discharge  coefficient  Free  flow  Model  experimentation  Piano  key  weir  Submerged  flow Résumé : A comprehensive experimental investigation was performed to better understand the effect of the weir geometry of a Piano Key weir (PKW) on the discharge coefficient for both free and submerged flow conditions. Experiments were conducted in a 12 m long, 0.4 m wide and 0.7 m deep rectangular glass-walled flume. The effects of the PKW geometry, including weir length and height, up- and downstream key widths as well as up- and downstream apex overhangs on the weir flow discharge coefficient were investigated, so that the governing weir head-discharge relationship resulted. In addition, on the basis of a comprehensive data set, practical discharge coefficient relations associated with the standard weir equation were proposed for both free and submerged flows over PKWs. The present correlations cover various types of PKWs. From the experimental data, optimum values of the primary dimensionless weir parameters result produce the maximum discharge efficiency. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2011.647888 [article] Discharge coefficients for free and submerged flow over Piano Key weirs [texte imprimé] / Abdorreza Kabiri-Samani, Auteur ; Amir Javaheri, Auteur . - 2012 . - pp. 114-120. Hydraulique Langues : Anglais (eng) in Journal of hydraulic research > Vol. 50 N° 1 (Janvier/Février 2012) . - pp. 114-120 Mots-clés : Discharge  coefficient  Free  flow  Model  experimentation  Piano  key  weir  Submerged  flow Résumé : A comprehensive experimental investigation was performed to better understand the effect of the weir geometry of a Piano Key weir (PKW) on the discharge coefficient for both free and submerged flow conditions. Experiments were conducted in a 12 m long, 0.4 m wide and 0.7 m deep rectangular glass-walled flume. The effects of the PKW geometry, including weir length and height, up- and downstream key widths as well as up- and downstream apex overhangs on the weir flow discharge coefficient were investigated, so that the governing weir head-discharge relationship resulted. In addition, on the basis of a comprehensive data set, practical discharge coefficient relations associated with the standard weir equation were proposed for both free and submerged flows over PKWs. The present correlations cover various types of PKWs. From the experimental data, optimum values of the primary dimensionless weir parameters result produce the maximum discharge efficiency. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2011.647888