2018 Volume 18 Issue 11 Pages 561-566
This article describes an application of flow birefringence techniques, using the modulated polarization laser beam and the 2D high speed polarization camera for a local flow around a tiny bubble under-pressure oscillating field. Complex local flow is observed around the bubble surface because the bubble shape deforms repeatedly at 20 Hz and 100 Hz. These rheooptic methods can be used to measure the retardation distribution, which is related to the stress field around the bubble. In addition, different retardation distributions were observed during the contraction and expansion phases.
