Flow resistance in skimming flows in stepped spillways and its modelling [PDF]
Canadian Journal of Civil Engineering, 2002 Dams and weirs must be equipped with adequate flood-release facilities for a safe dissipation of the kinetic energy of the flow. With stepped spillway design, it is essential to accurately predict the flow-resistance contribution of the steps. The authors investigate the flow resistance of skimming flows and associated form losses.
H Chanson, Youichi Yasuda, Iwao Ohtsu
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Re-aeration in skimming flow over stepped chutes: two-dimensional CFD modeling and empirical equations [PDF]
RBRHFlows in stepped chutes and spillways are highly turbulent and have the potential of absorbing and desorbing volatile compounds. The present work aimed to model the interfacial mass transfer in skimming flows using the two-resistance model and the ...
Thiago Reis Pereira Minho +6 more
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Drag reduction in skimming flow on stepped spillways by aeration [PDF]
Journal of Hydraulic Research, 2004 In skimming flows on stepped spillway, flow resistance is predominantly a form drag process. Cavity recirculation and air entrainment are intense. The interactions between entrained air bubbles and mixing layers may cause some reduction in flow resistance.
Chanson, Hubert, H. Chanson
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Numerical investigation of air-entrainment in skimming flow over stepped spillways
Theoretical and Applied Mechanics Letters, 2016 As a widely used flood energy dissipator, the stepped spillway can significantly dissipate the kinetic or hydraulic energy due to the air-entrainment in skimming flow over the steps.
Jiemin Zhan, Jianbo Zhang, Yejun Gong
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Cluster multispacecraft observations at the high-latitude duskside magnetopause: implications for continuous and component magnetic reconnection [PDF]
Annales Geophysicae, 2005 We report multispacecraft Cluster observations of magnetic reconnection at the high-latitude magnetopause/magnetospheric boundary layer (MP/BL) under mainly northward interplanetary magnetic field (IMF) conditions. The event we study is on 3 December
A. Retinò +15 more
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Effect of fractional blood flow on plasma skimming in the microvasculature [PDF]
Physical Review E, 2017 Although redistribution of red blood cells at bifurcated vessels is highly dependent on flow rate, it is still challenging to quantitatively express the dependency of flow rate in plasma skimming due to nonlinear cellular interactions. We suggest a plasma skimming model that can involve the effect of fractional blood flow at each bifurcation point. For
Yang, Jiho, Yoo, Sung Sic, Lee, Tae-Rin
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Re-Aeration on Stepped Spillways with Special Consideration of Entrained and Entrapped Air
Geosciences, 2018 As with most high-velocity free-surface flows, stepped spillway flows become self-aerated when the drop height exceeds a critical value. Due to the step-induced macro-roughness, the flow field becomes more turbulent than on a similar smooth-invert chute.
Daniel B. Bung, Daniel Valero
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CHARACTERISTICS OF NONUNIFORM AERATED SKIMMING FLOWS ON STEPPED CHANNELS
Journal of Japan Society of Civil Engineers Ser B1 (Hydraulic Engineering), 2017 Masayuki Takahashi, Iwao Ohtsu
exaly +3 more sources
FLOW CHARACTERISTICS OF SKIMMING FLOW IN A STEPPED CHANNEL
PROCEEDINGS OF HYDRAULIC ENGINEERING, 2004 Recently, research onto the hydraulics of stepped chutes was driven by needs for better design guidelines (OHTSU and YASUDA 1997, CHANSON and TOOMBES 2002, BOES and HAGER 2003). Although stepped channel flows are characterized by intense turbulence and strong flow aeration, most studies did not investigate the turbulence characteristics. In this study,
YASUDA, Youichi +2 more
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Turbulence and Cavity Recirculation in Air-Water Skimming Flows on a Stepped Spillway [PDF]
, 2008 Current expertise in air-water turbulent flows on stepped chutes is limited mostly to laboratory experiments at low to moderate Reynolds numbers on chutes with flat horizontal steps.
C.A. Gonzalez +3 more
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