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SUMMARY:Virtual MEchanics GAthering -MEGA- Seminar: On the dynamics of ent
 rapped microbubbles for acoustic streaming and thrust generation
DTSTART:20210422T161500
DTEND:20210422T173000
DTSTAMP:20260916T052445Z
UID:a64e68958fd8d65fec0646c17a03662714834adb9a290d8c9422ec9a
CATEGORIES:Conferences - Seminars
DESCRIPTION:Amit Dolev (MICROBS\, EPFL)\nAbstract Microbubbles in acousti
 c fields oscillate and give rise to acoustic radiation forces and drag-ind
 uced acoustic streaming. These forces are used for various biomedical appl
 ications such as targeted drug delivery\, on chip particle manipulation\, 
 microfluidic mixing\, and actuating robotic devices. Microbubbles are usua
 lly trapped inside microfabricated cavities for the application of anisotr
 opic forces where only parts of the bubbles oscillate. In this configurati
 on\, the existing analytical models derived for spherical bubbles are insu
 fficient.\n\nThe conventional wisdom is that bubbles should be excited at 
 their first resonance frequency to obtain good performances\, although\, t
 hey have infinite resonance frequencies. To estimate the natural frequenci
 es and the correlated normal vibration modes\, we developed a new model fo
 r an arbitrary shaped and entrapped bubble that has multiple circular open
 ings. The semi-analytical model captures a more realistic geometry via a s
 olution to an optimization problem. The vibration modes and natural freque
 ncies are then used to compute the acoustic streaming patterns and generat
 ed thrust via a finite element simulation. We built an experimental platfo
 rm to directly measure the deflection of the bubble and visualize the gene
 rated streaming patterns. However\, the model was not completely validated
  due to the nonlinear multiphysics nature of the problem. The complexity o
 f the problem highlights the contribution of our simplified model as a des
 ign tool.\n\nBio Amit Dolev joined the MicroBioRobotic Systems Laboratory
  headed by Prof. Sakar as a postdoctoral associate in January 2020. He rec
 eived his B.Sc. in Mechanical Engineering at Technion – Israel Institute
  of Technology and Ph.D. in the Dynamics Laboratory headed by Professor Iz
 hak Bucher at the Technion-IIT during a direct doctoral track. Currently\,
  he works on the utilization of acoustics for powering microscale technolo
 gies. He pursues a broad range of research interests including nonlinear d
 ynamics\, fluid-structure interactions\, vibrations\, signal processing\, 
 acoustics\, and control.\n 
LOCATION:https://epfl.zoom.us/s/84678428267 Passcode: 174387 https://epfl.
 zoom.us/s/84678428267
STATUS:CONFIRMED
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