Supercritical flow in circular conduit bends
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 flowSource:
Journal of Hydraulic Research, 2015, 53, 1, 93-100Publisher:
- Taylor and Francis Ltd.
Funding / 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
Institution/Community
GraFarTY - JOUR AU - Kolarević, Milena AU - Savić, Ljubodrag AU - Kapor, Radomir AU - Mladenović, Nikola PY - 2015 UR - https://grafar.grf.bg.ac.rs/handle/123456789/696 AB - 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. PB - Taylor and Francis Ltd. T2 - Journal of Hydraulic Research T1 - Supercritical flow in circular conduit bends EP - 100 IS - 1 SP - 93 VL - 53 DO - 10.1080/00221686.2014.932856 ER -
@article{ author = "Kolarević, Milena and Savić, Ljubodrag and Kapor, Radomir and Mladenović, Nikola", year = "2015", 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.", publisher = "Taylor and Francis Ltd.", journal = "Journal of Hydraulic Research", title = "Supercritical flow in circular conduit bends", pages = "100-93", number = "1", volume = "53", doi = "10.1080/00221686.2014.932856" }
Kolarević, M., Savić, L., Kapor, R.,& Mladenović, N.. (2015). Supercritical flow in circular conduit bends. in Journal of Hydraulic Research Taylor and Francis Ltd.., 53(1), 93-100. https://doi.org/10.1080/00221686.2014.932856
Kolarević M, Savić L, Kapor R, Mladenović N. Supercritical flow in circular conduit bends. in Journal of Hydraulic Research. 2015;53(1):93-100. doi:10.1080/00221686.2014.932856 .
Kolarević, Milena, Savić, Ljubodrag, Kapor, Radomir, Mladenović, Nikola, "Supercritical flow in circular conduit bends" in Journal of Hydraulic Research, 53, no. 1 (2015):93-100, https://doi.org/10.1080/00221686.2014.932856 . .