Physical modelling to minimise air entrainment over an industrial weir and into a discharge pipeline

Miller, B. M. and Peirson, W. L. (2014). Physical modelling to minimise air entrainment over an industrial weir and into a discharge pipeline. 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.2014.43

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Author Miller, B. M.
Peirson, W. L.
Title of paper Physical modelling to minimise air entrainment over an industrial weir and into a discharge pipeline
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.2014.43
Open Access Status DOI
ISBN 9781742721156
Editor Hubert Chanson
Luke Toombes
Start page 1
End page 8
Total pages 8
Language eng
Abstract/Summary Physical modelling was used to simulate cooling water flow entering a chamber over an industrial weir and exiting through long discharge pipelines. The weir was required to maintain a backwater for condensers, but also resulted in significant aeration of the flow. The objectives were to minimise the air entrained to the discharge pipeline and to ensure de-aeration of any air within the pipeline was fully effective. Physical modelling was selected as the most reliable means of investigation as the complex air entrainment and free surface interactions would require highly complex CFD numerical modelling, with limited confidence in the results. The physical modelling study concentrated on flow patterns, air entrainment and the amount of air released within the chamber, discharge pipes and air release structures. A suite of flow and entrainment characterisations by dimensionless numbers have been assembled from the literature and used to scale the model of this complex system. The study highlights the need for careful consideration of geometry to minimise aeration and how relatively simple changes to flow asymmetry can reduce the air entrainment. The solution is relevant to other entrainment problems.
Keyword Physical modelling
Aeration
De-aeration
Weir
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status Non-UQ

 
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Created: Wed, 14 May 2014, 00:55:30 EST by Anthony Yeates on behalf of Scholarly Communication and Digitisation Service