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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Special sessions : Image processing for bubble image velocimetry in self-aerated flows
Image processing for bubble image velocimetry in self-aerated flows
Author : DANIEL B. BUNG(1) & DANIEL VALERO(2)
ABSTRACT
In this study, different preprocessing techniques have been applied in order to test if the accuracy of Bubble Image
Velocimetry (BIV) calculations in self-aerated flows can be improved. For this purpose, high-speed movies with a
resolution of 1920 × 1200 px and a frame rate of 730 Hz are captured on a stepped spillway model with a Phantom M120
camera supplied by LaVision. BIV results are obtained by application of the open-source Matlab® toolbox PIVlab and
compared to intrusive data from a double-tip conductivity probe. Averaging velocity fields from 249 frame pairs help to
obtain robust results. Therefore, BIV is carried out in a loop with preceding variation of image processing techniques.
Results show some potential improvement for the same cross correlation algorithm and post-processing options.
However, BIV results tend to underestimate flow velocities when compared to the conductivity probe data.
File Size : 2,134,929 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Special sessions
Date Published : 19/08/2015
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