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. Author manuscript; available in PMC: 2013 Sep 12.
Published in final edited form as: Phys Rev Lett. 2010 Aug 9;105(7):078101. doi: 10.1103/PhysRevLett.105.078101

Figure 2.

Figure 2

(Color online) Fluid motion. a. High-speed imaging of bubble dynamics and micro-Particle Image Velocimetry (μPIV) using 10x10 μm interrogation windows with 25% overlap indicating the flow direction around individual oscillating microbubbles. Flow tracers (i.e., 2 μm polystyrene beads) were used to facilitate visualization of the velocity field. b. Streamline display of three μPIV images, demonstrating vortex formation in the flow field, with one pair of vortices rotating clockwise and the other counterclockwise within 22 μs (Supplementary movie 3) following the generation of the tandem microbubble.