自由空间单气泡溃灭过程研究

Study on Collapse Process of Single Bubbles in Free Space

气泡的溃灭和压力波的释放是经典的复杂问题。由于实验观测设备的时空分辨率有限,以及数值模拟处理强间断面的困难,目前一般采用理想气泡方程估算气泡溃灭时的压力波释放过程。该文采用基于状态方程的两相流方法,对单气泡溃灭过程进行了可压缩数值模拟,考察了气泡在自由空间的溃灭过程和压力波的产生过程,认为气泡溃灭瞬间压力波的释放是由不同向运动的流体在泡壁附近发生水锤撞击引起的。

The collapse of bubbles and the release of pressure waves are classic and intricate problems. Due to the limited spatiotemporal resolution of experimental observation devices and the computational challenges in handling strong discontinuities in numerical simulations, the ideal bubble equation is generally used to estimate the pressure wave release during bubble collapse.Using a two-phase flow method based on state equations, in this paper a compressible numerical simulation of the single bubble collapse process is employed. The collapse of bubbles in free space and the generation of pressure waves are examined. It can be considered that the instantaneous release of pressure waves during bubble collapse is induced by water hammer impacts of fluid moving in different directions near the bubble wall.