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Characteristics of Skimming Flow over Stepped Spillways [PDF]
Journal of Hydraulic Engineering, 2000 The discusser wishes to congratulate the authors for their authoritative paper. He believes that the work is a necessary addition to the topic of stepped spillway flow. The paper presents a true systematic study of skimming flow. Despite the outstanding insights of the study, the discusser wishes to point two weaknesses: an inadequate analysis of the ...
Boes, Robert M. +10 more
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Skimming Flow in Stepped Spillways
Journal of Hydraulic Engineering, 1990Flow on stepped spillways can be divided into nappe and skimming flow regimes. This technical note presents an approximate method of predicting the characteristics of skimming flow on stepped spillways. Expressing the turbulent shear stress between the skimming stream and the recirculating fluid, trapped by the stream between the steps, in terms of a ...
N Rajaratnam, Rajaratnam N
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Aerated flow characteristics of skimming flow over stepped chutes
Journal of Hydraulic Research/De Recherches Hydrauliques, 2012Stepped 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
Masayuki Takahashi, Iwao Ohtsu
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Skimming of microspheres in vitro: implications for measurement of intrarenal blood flow
American Journal of Physiology-Heart and Circulatory Physiology, 1981 Skimming could result in erroneous estimation of renal cortical blood flow distribution as measured by microspheres. Skimming of microspheres with diameters 10, 12, and 15 micrometers and red blood cells was therefore studied in a model in which an interlobular artery and its first arteriolar branch were simulated by 80- and 30-micrometers-wide slits ...
E S, Ofjord, G, Clausen, K, Aukland
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Alternating skimming flow over a stepped spillway
Environmental Fluid Mechanics, 2016The study of stepped spillways in laboratory scales has been essentially focused on two separated sub-regimes within skimming flow. In this paper we investigate the appearance of an unclassified alternating skimming flow regime in a 0.5 m wide stepped spillway which does not fit on these earlier definitions, and which does not occur in a 0.3 m wide ...
Pedro Lopes +2 more
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Numerical investigation of alternating skimming flow over a stepped spillway
Water Science and Technology: Water Supply, 2021 This study aims to illustrate the influence of stepped spillway width on alternating skimming flow development. A computational fluid dynamics (CFD) model in Ansys Fluent® was established to simulate the flow over stepped spillways, using a volume of ...
Anouar Kaouachi +2 more
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ENERGY DISSIPATION IN SKIMMING FLOW OVER STEPPED SPILLWAYS
ISH Journal of Hydraulic Engineering, 1996ABSTRACT Stepped spillways are provided to reduce the size of stilling basins with the view of reducing the overall cost of spillway and energy dissipation device. The characteristics of flow over stepped spillway are still not well known. This paper presents an equation for estimation of energy loss on stepped spillway for skimming flow regime, which ...
Sandip P Tatewar
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Experimental Study of Turbulence Manipulation in Stepped Spillways: Implications on Flow Resistance in Skimming Flows [PDF]
, 2005 Current expertise in air-water turbulent flows on stepped chutes is limited to laboratory experiments at low to moderate Reynolds numbers on flat horizontal steps. In this study, highly turbulent air-water flows skimming down a large-size stepped chute were systematically investigated with a 22 degree slope.
Gonzalez, Carlos A., Chanson, Hubert
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Hydraulics of skimming flows on stepped chutes: The effects of inflow conditions? [PDF]
Journal of Hydraulic Research/De Recherches Hydrauliques, 2006 Modern stepped spillways are typically designed for large discharge capacities corresponding to a skimming flow regime for which flow resistance is predominantly form drag.
Hubert Chanson
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Onset of Skimming Flow on Stepped Spillways
Journal of Hydraulic Engineering, 2001Assuming that skimming flow occurs when the jet leaving a step has a slope equal to that of the stepped spillway when it impinges on the pool behind it on the next step, an equation has been developed to predict the incipient value of \Iy\dc/\ih, where \iy\dc = critical depth and \ih = step height. This equation was found to agree well with most of the
C. S. James +9 more
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