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A platform for research: civil engineering, architecture and urbanism
Capacity loss in siphonic roof drainage systems due to aeration
An experimental investigation into air entrainment in siphonic roof drainage systems is presented. By injecting known quantities of air into a 4.7 m high experimental test rig, the effect of aeration on flow velocity and flow capacity in the siphonic system was determined. A preliminary relationship between air/water content and a decrease in system capacity was formulated. This indicated that system capacity can decrease by up to 40% for air/water ratios approaching 45%. At typical operational air/water ratios of approximately 10%, system capacity decreased by 16% from the assumed no-air-design situation. In addition, average velocities in the pipework decreased by 13% for air/water ratios of 35%. Friction and form losses were also measured and compared with theoretical values. Une etude experimentale sur l'entrainement d'air dans les systemes d'evacuation des eaux de toiture par effet siphoide est presentee. En injectant des quantites connues d'air dans un banc d'essai experimental de 4,70 m de hauteur, l'effet de l'aeration sur la vitesse d'ecoulement et le debit dans le systeme a siphon a ete determine. Il a ete formule une correlation preliminaire entre le rapport air/eau et une diminution du debit du systeme. Celle-ci indiquait que le debit du systeme peut enregistrer jusqu'a 40% de diminution pour des rapports air/eau approchant les 45%. A des rapports air/eau operationnels types d'environ 10%, le debit du systeme a diminue de 16% par rapport a la situation supposee d'utilisation d'un systeme fonctionnant sans air. En outre, les vitesses moyennes dans la tuyauterie ont diminue de 13% pour des rapports air/eau de 35%. Les pertes de charge et de forme ont egalement ete mesurees et comparees aux valeurs theoriques. Mots cles: aeration systemes d'evacuation des eaux pertes de forme frottement dans la tuyauterie toitures systeme d'evacuation des eaux de toiture par effet siphoide ecoulement diphasique
Capacity loss in siphonic roof drainage systems due to aeration
An experimental investigation into air entrainment in siphonic roof drainage systems is presented. By injecting known quantities of air into a 4.7 m high experimental test rig, the effect of aeration on flow velocity and flow capacity in the siphonic system was determined. A preliminary relationship between air/water content and a decrease in system capacity was formulated. This indicated that system capacity can decrease by up to 40% for air/water ratios approaching 45%. At typical operational air/water ratios of approximately 10%, system capacity decreased by 16% from the assumed no-air-design situation. In addition, average velocities in the pipework decreased by 13% for air/water ratios of 35%. Friction and form losses were also measured and compared with theoretical values. Une etude experimentale sur l'entrainement d'air dans les systemes d'evacuation des eaux de toiture par effet siphoide est presentee. En injectant des quantites connues d'air dans un banc d'essai experimental de 4,70 m de hauteur, l'effet de l'aeration sur la vitesse d'ecoulement et le debit dans le systeme a siphon a ete determine. Il a ete formule une correlation preliminaire entre le rapport air/eau et une diminution du debit du systeme. Celle-ci indiquait que le debit du systeme peut enregistrer jusqu'a 40% de diminution pour des rapports air/eau approchant les 45%. A des rapports air/eau operationnels types d'environ 10%, le debit du systeme a diminue de 16% par rapport a la situation supposee d'utilisation d'un systeme fonctionnant sans air. En outre, les vitesses moyennes dans la tuyauterie ont diminue de 13% pour des rapports air/eau de 35%. Les pertes de charge et de forme ont egalement ete mesurees et comparees aux valeurs theoriques. Mots cles: aeration systemes d'evacuation des eaux pertes de forme frottement dans la tuyauterie toitures systeme d'evacuation des eaux de toiture par effet siphoide ecoulement diphasique
Capacity loss in siphonic roof drainage systems due to aeration
Lucke, Terry (author) / Beecham, Simon (author)
Building Research & Information ; 38 ; 206-217
2010-03-01
12 pages
Article (Journal)
Electronic Resource
English
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