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Supercritical flow in circular conduit bends

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2015
Authors
Kolarević, Milena
Savić, Ljubodrag
Kapor, Radomir
Mladenović, Nikola
Article (Published version)
Metadata
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Abstract
A complex flow pattern occurring in a circular conduit bend with supercritical flow has been studied. The main objective was to obtain reliable criteria for prediction of the onset of helical and choking flow, in order to facilitate the design of bottom outlets, tunnel spillways and drainage collectors with bends. A series of scale model experiments provided data for developing empirical relationships describing the effects of the bend curvature, bend deflection angle and approach flow conditions (relative flow depth and Froude number) on the inception of helical and choking flow. Expressions for the energy bend loss coefficient were also proposed. The bend curvature and approach flow conditions proved to have a major influence on the onset of helical flow, while the deflection angle becomes an important parameter for angles less than 45 degrees. Bend curvature and deflection angle have commensurable influence on the onset of choking flow.
Keywords:
Choking flow / closed conduit / energy bend loss / helical flow / horizontal bend / hydraulic model / supercritical flow
Source:
Journal of Hydraulic Research, 2015, 53, 1, 93-100
Publisher:
  • Taylor and Francis Ltd.
Projects:
  • Monitoring and Modeling of Rivers and Reservoirs (MORE) - Physical, Chemical, Biological and Morphodynamic Parameters (RS-37009)
  • Research and development of equipment and systems for industrial production, storage and processing vegetables and fruits (RS-35043)

DOI: 10.1080/00221686.2014.932856

ISSN: 0022-1686

WoS: 000352856000008

Scopus: 2-s2.0-84925815658
[ Google Scholar ]
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3
URI
http://grafar.grf.bg.ac.rs/handle/123456789/696
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  • Radovi istraživača / Researcher's publications
  • Катедра за материјале и конструкције
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