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Water 2017, 9(1), 65; doi:10.3390/w9010065

Influence of Rack Slope and Approaching Conditions in Bottom Intake Systems

Hidr@m Group, Department of Civil Engineering, Universidad Politécnica de Cartagena, Paseo Alfonso XIII, 52, 30203 Cartagena, Spain
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Author to whom correspondence should be addressed.
Academic Editors: Gordon Huang and Yurui Fan
Received: 7 December 2016 / Revised: 12 January 2017 / Accepted: 16 January 2017 / Published: 21 January 2017
(This article belongs to the Special Issue Modeling of Water Systems)
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Abstract

The study analyzes the flow over bottom racks made of longitudinal T-shaped bars. A clear water flow is considered in a laboratory flume. Free surface profiles, wetted rack lengths, and discharge coefficients are measured, changing parameters such as longitudinal slope, void ratio, and approaching flow. The present work complements existing experimental studies, considering the influence of the approaching flow conditions. The velocity field measured with Particle Image Velocimetry (PIV) technique and the pressure field with Pitot tubes are quantified. Numerical simulations (CFD) are used to complement laboratory data. The energy head along the rack is calculated and compared with the hypothesis of horizontal energy level with minimum energy at the beginning of the rack. A discharge coefficient adjustment that considers the slope, the void ratio, and the position along the rack is proposed and presented with the results of other works. Theoretical proposals to calculate the pressure field along the flow are compared with measurements in the laboratory. The relation between the static pressure head in the space of bars and the discharge coefficient is used as an alternative method to define the discharge. View Full-Text
Keywords: intake system; bottom racks; discharge coefficient; velocity distribution; pressure distribution; particle image velocimetry; computational fluid dynamics intake system; bottom racks; discharge coefficient; velocity distribution; pressure distribution; particle image velocimetry; computational fluid dynamics
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Castillo, L.G.; García, J.T.; Carrillo, J.M. Influence of Rack Slope and Approaching Conditions in Bottom Intake Systems. Water 2017, 9, 65.

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