Abstract

The dynamic behaviors of single acoustic bubble are the key fundamental problem in exploring the mechanism of acoustic cavitation. In this paper, a synchronous high-speed microscopic imaging method is proposed to clearly record the temporary evolution of single bubble in low-frequency ultrasonic field. In the experiment, the temporal evolution of the bubble with two different initial radii in an ultrasonic field are recorded by the high-speed camera at 300 000 frames per second, and other important characteristics of the bubbles are calculated and analyzed. In these experiments, the single bubbles behave similar under the same relative distance from a rigid wall, but the dynamic behaviors of the bubble with different initial radii have obvious difference. In addition, the bubble dynamics of the bubble near an elastic wall are also investigated and compared to the bubble near the rigid wall. It is found that the elasticity would significantly influence the dynamic characteristics during bubble collapse and rebound. In this work, the synchronous high-speed microscopic imaging method demonstrates the abilities to experimentally investigate the rapidly dynamics of single bubble in ultrasonic field.

中文翻译：

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刚性和弹性壁附近的声驱动单个微气泡的动力学特性

摘要

单个声泡的动力学行为是探索声空化机理的关键基本问题。本文提出了一种同步高速显微成像方法，以清晰地记录低频超声场中单个气泡的暂时演化。在实验中，高速相机以每秒30万帧的速度记录超声场中具有两个不同初始半径的气泡的时间演变，并计算和分析了气泡的其他重要特征。在这些实验中，单个气泡在距刚性壁的相同相对距离下的行为相似，但是具有不同初始半径的气泡的动力学行为存在明显差异。此外，还研究了弹性壁附近的气泡的动力学，并将其与刚性壁附近的气泡进行了比较。发现在气泡破裂和回弹期间，弹性将显着影响动力学特性。在这项工作中，同步高速显微成像方法展示了在超声场中实验研究单个气泡快速动力学的能力。