Response of an ultrasonically excited bubble near a fixed rigid object Response of an ultrasonically excited bubble near
a fixed rigid object
Hongyu Miao
Department of Mechanical Engineering, University of Rochester, Rochester, NewYork 14627
Sheryl M. Gracewskia)
Departments of Mechanical Engineering and Biomedical Engineering, and Rochester Center for Biomedical
Ultrasound, University of Rochester, Rochester, NewYork 14627
Abstract: Various independent studies suggest that echo-contrast agents
can increase the likelihood of ultrasonic bioeffects. To better understand bioeffects
involving cavitation, a two-dimensional boundary element model was
used to simulate ultrasonically excited bubble behavior near a rigid object,
either a plane, sphere, or disk, the approximate size of a red blood cell. As the
distance between the object and bubble increases, the bubble collapse becomes
more spherically symmetric, producing higher maximum bubble pressures.
Pressure and velocity fields around a bubble collapsing near a rigid disk
are compared for two distances, demonstrating differences between more
spherically symmetric and asymmetric bubble collapses.
© 2005 Acoustical Society of America
PACS numbers: 43.80.Gx, 43.35.Ei, 43.35.Wa, 43.25.Yw
Date Received: January 15, 2005 Date Accepted: April 7, 2005