Dynamic masking of PIV images using the Radon transform in free surface flows |
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Authors: | Arnaud Sanchis Atle Jensen |
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Institution: | (1) Mechanics Division, Department of Mathematics, University of Oslo, PO Box 1053, Blindern, 0316, Oslo, Norway |
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Abstract: | Particle image velocimetry (PIV) processing of free surface flow images often requires the use of digital masks to overcome
the problems caused by the interface. In cases where a large number of particle images are collected it is essential that
the time-varying boundary between the two phases can be tracked automatically to produce the binary masks. The Radon transform-based
technique presented in this paper allows the automatic detection of the air–water interface in a stream of particle images
acquired from a single camera. It is applied to time-resolved PIV measurements in the liquid phase of a stratified multiphase
flow in a circular pipe. Accuracy estimations are provided using synthetic and real wave profiles. An extension to the more
complex case of an overturning wave is also discussed. |
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