Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session ZC21: Quantitative Flow Visualization III: PIV, PTV, PLIF
12:50 PM–3:00 PM,
Tuesday, November 21, 2023
Room: 147A
Chair: Leah Mendelson, Harvey Mudd College
Abstract: ZC21.00004 : Ultra-Fast Optical Imaging of Bubbly Flows*
1:29 PM–1:42 PM
Presenter:
Daniel A Hunter
(George Washington University)
Authors:
Daniel A Hunter
(George Washington University)
Philippe Bardet
(George Washington University)
Incident light on a bubble plume is scattered due to the change in refractive index and bubble curvature. With this change of direction and speed, there will be an inherent time delay between scattered and unscattered light. Such a delay produces a sub-picosecond temporal distribution in intensity received by a detector, where the initial peak corresponds to light passing directly through a bubble's optical central axis. Experimental measurement, therefore, employs the non-linear Optical Kerr Effect (OKE) to produce sub-picosecond time-resolved images of light scatted by cavitation bubbles. Using a 1 kHz 800 nm Ti:Sapphire laser generating 70 fs Q-switched pulses, UFO images have been acquired with a temporal spacing of 33 fs, potentially reaching 0.67 fs.
*Office of Naval Research (ONR)
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