Boulder Fluid and Thermal Sciences Seminar Series

Tuesday, November 27, 2018

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3:30pm-4:30pm (refreshments at 3:15pm)
Mechanical Engineering Conference Rooms
Engineering Center
University of Colorado at Boulder

Add to Calendar 11/27/2018 3:30:00 PM 11/27/2018 4:30:00 PM 9 Boulder Fluid and Thermal Sciences Seminar Mechanical Engineering Conference Rooms, Engineering Center, University of Colorado, Boulder MM/DD/YYYY

The Curious Dynamics of Translating Bubbles: Nonspherical Shape Oscillation, Stability, and the Influence of Encapsulation

Michael Calvisi University of Colorado, Colorado Springs

When subject to an acoustic field, bubbles will translate and oscillate in interesting ways. This motion is highly nonlinear and its understanding is essential to the application of bubbles in diagnostic ultrasound imaging, microbubble drug delivery, and acoustic cell sorting, among others. This talk will review some of the interesting physics that occur when bubbles translate in an acoustic field, including Bjerknes forces, the added mass effect, and acoustic trapping. The influence of an encapsulating shell on the nonspherical shape oscillation and stability of a translating microbubble will be analyzed in detail and the results from recent simulations presented. The findings demonstrate the counterintuitive result that, compared to a free gas bubble, the encapsulation actually promotes instability when the microbubble translates due to an acoustic wave.

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Acknowledgment

Support from Herbert and Karen Vogel is gratefully acknowledged through a Vogel Faculty Fellowship at the University of Colorado, Boulder.

Schedule

Location

The seminar is held at the Discovery Learning Center (DLC) at the University of Colorado. Parking is free with a permit, which is provided at the seminar. The location for parking is shown in the map below.

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