Results 221 to 230 of about 775 (254)

Onset of Skimming Flow on Stepped Spillways

Journal of Hydraulic Engineering, 2001
Assuming 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, Jorge Matos, Iwao Ohtsu, Youichi Yasuda, Masayuki Takahashi, Sandip P. Tatewar, Ramesh N. Ingle, Prakash D. Porey, M. R. Chamani, N. Rajaratnam   +9 more
openaire   +1 more source

Effect of the skimming layer on electro-osmotic—Poiseuille flows of viscoelastic fluids

Microfluidics and Nanofluidics, 2010
An analytical solution is derived for the microchannelflow of viscoelastic fluids by combined electroosmosisand pressure gradient forcing. The viscoelasticfluid is described by the Phan-ThienTanner model withdue account for the near-wall layer depleted ...
A M Afonso, F T Pinho, M A Alves
exaly   +2 more sources

Aerated flow characteristics of skimming flow over stepped chutes

Journal of Hydraulic Research, 2013
By MASAYUKI TAKAHASHI and IWAO OHTSU, J. Hydraulic Res. 50(4), 2012, 427–434The discussers read the paper with interest and congratulate the authors for their remarkable contribution.
Boes, Robert M., Lucas, Jill, Hager, Willi H.   +2 more
openaire   +2 more sources

Characteristics of Skimming Flow over Stepped Spillways

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., Chanson, Hubert, Matos, Jorge, Ohtsu, I., Yasuda, Y., Takahasi, M., Tatewar, Sandip P., Ingle, Ramesh N., Porey, Prakash D., Chamani, M. R., Rajaratnam, N.   +10 more
openaire   +4 more sources

Skimming Flow in Stepped Spillways

Journal of Hydraulic Engineering, 1990
Flow 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 ...
openaire   +1 more source

Developing flow in skimming flow regime on embankment stepped spillways

Journal of Hydraulic Research, 2012
By DANIEL B. BUNG, Journal of Hydraulic Research, Vol. 49, No. 5 (2011), pp. 639–648 The author investigated the air concentration, the aerated flow velocity, and the flow depth in the developing f...
Masayuki Takahashi, Iwao Ohtsu
openaire   +1 more source

Hydraulics of Skimming Flow on Modeled Stepped Spillways

Journal of Hydraulic Engineering, 2000
Two sets of models of stepped spillways of slope 1 upon 0.6 with the same crest-shape and with a range of step sizes (0.25–2.0 m on the 1:10 scale and 0.5–2.0 m on the 1:20 scale models) were built and studied. In the range of prototype unit flows considered (0.8–3.8 m2/s on the 1:10 scale models and 1.8–21.7 m2/s on the 1:20 models), the residual ...
Boes, Robert M., Matos, Jorge, Ohtsu, I., Yasuda, Y., Takahashi, M., Tatewar, S. P., Ingle, R. N., Porey, P. D., Pegram, Geoffrey G. S., Officer, Andrew K., Mottram, Samuel R.   +10 more
openaire   +2 more sources

Flow Resistance in Skimming Flows and its Modelling [PDF]

, 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 predict accurately the flow resistance associated with the steps. The authors investigate the flow resistance of skimming flows and associated form losses.
Chanson, Hubert, Yasuda, Youichi, Ohtsu, Iwao   +2 more
openaire   +2 more sources

Characteristics of Skimming Flow over Stepped Spillways

Journal of Hydraulic Engineering, 1999
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 ...
M. R. Chamani, N. Rajaratnam
openaire   +1 more source

Alternating skimming flow over a stepped spillway

Environmental Fluid Mechanics, 2016
The 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, Jorge Leandro, Rita F. Carvalho, Daniel B. Bung   +3 more
openaire   +2 more sources