Finite Element Analysis of Dynamic Behavior of Microbubble with Different Wall Shapes

In order to study the difference in dynamic behavior of microbubble near rigid plane, convex and concave surfaces, a finite element model of three kinds of microbubble near rigid walls under ultrasonic excitation was established. Results show that the microbubble deformation near the rigid concave surface is more obvious, and it is easy to cause transient cavitation and rupture. At the same time, the microbubble has a dynamic behavior that was deviating from the initial position and oscillating toward the wall. When the acoustic parameters and the distance from the bottom of the wall are equal, the center of gravity of the microbubble under the nearly rigid concave surface oscillates more violently, and the deviation from the initial position is the largest. The pressure on the concave surface is relatively large, the pressure on the convex surface is relatively small, and the pressure on the wall surface is positively correlated with the incident sound pressure, and the deviation between the pressure on the plane and the center of gravity of the nearby microbubble is between the convex and concave surfaces. The proposed model can provide a theoretical reference for targeted drug therapy and other aspects.