Boundary between air entrainment and air transport downstream of a hydraulic jump in circular conduits

Pozos, O., Gonzalez, C. A., Pedrozo, A., Sanchez, A. and Rodal, E. (2014). Boundary between air entrainment and air transport downstream of a hydraulic jump in circular conduits. In: Hubert Chanson and Luke Toombes, Hydraulic structures and society - Engineering challenges and extremes. 5th IAHR International Symposium on Hydraulic Structures, Brisbane, Australia, (1-8). 25-27 June 2014. doi:10.14264/uql.2014.39

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Author Pozos, O.
Gonzalez, C. A.
Pedrozo, A.
Sanchez, A.
Rodal, E.
Title of paper Boundary between air entrainment and air transport downstream of a hydraulic jump in circular conduits
Conference name 5th IAHR International Symposium on Hydraulic Structures
Conference location Brisbane, Australia
Conference dates 25-27 June 2014
Proceedings title Hydraulic structures and society - Engineering challenges and extremes
Journal name ISHS 2014 - Hydraulic Structures and Society - Engineering Challenges and Extremes: Proceedings of the 5th IAHR International Symposium on Hydraulic Structures
Place of Publication Brisbane, Australia
Publisher The University of Queensland
Publication Year 2014
Year available 2014
Sub-type Fully published paper
DOI 10.14264/uql.2014.39
Open Access Status DOI
ISBN 9781742721156
Editor Hubert Chanson
Luke Toombes
Start page 1
End page 8
Total pages 8
Language eng
Abstract/Summary The transition from partially full to full flow in downward sloping pipes often occurs with a hydraulic jump that entrains air bubbles downstream in a filled conduit that makes it difficult to define the boundary between the air entrainment and air transport behind the jump in circular conduits. With the aim of addressing this issue, an experimental investigation that included the measurement of air bubble velocities with a high speed camera at distances of 1, 5 and 10 diameters downstream of the jump was carried out. The analysis results showed that when the distance beyond the jump was less than 10 diameters, the velocity profiles were irregular and influenced by the eddying action of the jump; however, when it was greater than 10 diameters, the velocity distribution was very similar to that of a typical fully developed velocity profile in a circular conduit.The work concentrated on a mild downward slope S = 0.087 ( = 5°) and small Froude numbers ranged from 0.045 to 2.04.
Keyword Air entrainment
Air transport
Hydraulic jump
Velocity profiles
High speed camera
Q-Index Code E1
Q-Index Status Confirmed Code
Institutional Status Non-UQ

 
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Created: Wed, 14 May 2014, 00:17:48 EST by Anthony Yeates on behalf of Scholarly Communication and Digitisation Service