Estimating void fraction in a hydraulic jump by measurements of pixel intensity

Leandro, J., Carvahlo, R., Chachereau, Y. and Chanson, H. (2012) Estimating void fraction in a hydraulic jump by measurements of pixel intensity. Experiments in Fluids, 52 5: 1307-1318. doi:10.1007/s00348-011-1257-1

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Author Leandro, J.
Carvahlo, R.
Chachereau, Y.
Chanson, H.
Title Estimating void fraction in a hydraulic jump by measurements of pixel intensity
Journal name Experiments in Fluids   Check publisher's open access policy
ISSN 0723-4864
1432-1114
Publication date 2012-05
Sub-type Article (original research)
DOI 10.1007/s00348-011-1257-1
Open Access Status File (Author Post-print)
Volume 52
Issue 5
Start page 1307
End page 1318
Total pages 12
Place of publication Heidelberg, Germany
Publisher Springer
Collection year 2013
Language eng
Abstract A hydraulic jump is a sudden transition from supercritical to subcritical flow. It is characterized by a highly turbulent roller region with a bubbly two-phase flow structure. The present study aims to estimate the void fraction in a hydraulic jump using a flow visualization technique. The assumption that the void fraction in a hydraulic jump could be estimated based on images' pixel intensity was first proposed by Mossa and Tolve (J Fluids Eng 120:160-165, 1998). While Mossa and Tolve (J Fluids Eng 120:160-165, 1998) obtained vertically averaged air concentration values along the hydraulic jump, herein we propose a new visualization technique that provides air concentration values in a vertical 2-D matrix covering the whole area of the jump roller. The results obtained are found to be consistent with new measurements using a dual-tip conductivity probe and show that the image processing procedure (IPP) can be a powerful tool to complement intrusive probe measurements. Advantages of the new IPP include the ability to determine instantaneous and average void fractions simultaneously at different locations along the hydraulic jump without perturbing the flow, although it is acknowledged that the results are likely to be more representative in the vicinity of sidewall than at the center of the flume.
Keyword Bubbly flow
Image velocimetry
2-phase flow
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Received: 15 November 2010 / Revised: 18 November 2011 / Accepted: 20 December 2011 / Published online: 3 January 2012

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
Official 2013 Collection
 
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Citation counts: TR Web of Science Citation Count  Cited 10 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 8 times in Scopus Article | Citations
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Created: Wed, 02 May 2012, 06:32:56 EST by Hubert Chanson on behalf of School of Civil Engineering