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Water 2018, 10(8), 1035; https://doi.org/10.3390/w10081035

Empirical, Dimensional and Inspectional Analysis in the Design of Bottom Intake Racks

1
Civil Engineering Department, Universidad Politécnica de Cartagena, Paseo Alfonso XIII, 52, Cartagena 30203, Spain
2
Civil and Environmental Engineering Department, Escuela Politécnica Nacional, Ladrón de Guevera E11-253, Quito 170517, Ecuador
*
Author to whom correspondence should be addressed.
Received: 11 July 2018 / Revised: 27 July 2018 / Accepted: 1 August 2018 / Published: 4 August 2018
(This article belongs to the Section Hydraulics)
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Abstract

Flow over bottom racks is highly turbulent, three-dimensional and spatially varied. The design of bottom intake systems has mainly been studied in the laboratory. The comparison of existing experimental studies shows large deviations in the definition of design parameters such as wetted rack length. Each experimental study is limited to a single bar type or to a low range of void ratios, which makes it difficult to generalize the observed data. A combination of empirical, dimensional and inspectional analysis is presented as a useful tool to reduce the number of variables with influence in the design parameters, such as the wetted rack length or the mean discharge coefficient. This work includes a broad experimental campaign in which wetted rack length and mean discharge coefficient are characterized using five different bottom racks with different void ratios (area between bars divided by total area). T-shaped flat and circular bars are considered as well as five different longitudinal slopes. Empirical and inspectional analyses have allowed us to verify, in two different ways, the relation between wetted rack length and incoming flow through potential functions. The influence of the viscous forces has been studied as a function of the incoming flow. Similar results may be obtained when analysing the Froude number at the beginning of the rack, depending on the wetted rack length. A new formulation for calculating the mean discharge coefficient and wetted rack length is proposed. View Full-Text
Keywords: empirical analysis; dimensional analysis; inspectional analysis; bottom rack; mean discharge coefficient; rack length empirical analysis; dimensional analysis; inspectional analysis; bottom rack; mean discharge coefficient; rack length
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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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García, J.T.; Castillo, L.G.; Carrillo, J.M.; Haro, P.L. Empirical, Dimensional and Inspectional Analysis in the Design of Bottom Intake Racks. Water 2018, 10, 1035.

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