Page 9 - 《应用声学》2020年第3期

第 39 卷 第 3 期 Vol. 39, No. 3
2020 年 5 月 Journal of Applied Acoustics May, 2020

⋄ 研究报告 ⋄

超声对近壁微气泡溃灭过程的影响 ∗

王舰航 陈韬厚 包福兵 † 王月兵

(中国计量大学计量测试工程学院 杭州 310018)

摘要：近壁微气泡溃灭特性的深入研究对靶向给药和基因治疗等技术具有较好的指导作用。该文基于数值模
拟技术，采用有限体积法结合流体体积模型对超声作用下的近壁微气泡溃灭特性进行了研究，分析了超声对
近壁微气泡溃灭动力学过程的影响。结果表明气泡溃灭最大射流速度与近壁距离无量纲参数 γ 在 1.1 ∼ 1.6
范围内时成正比，与超声频率在 10 ∼ 60 Hz 范围内时成正比，与气泡初始半径在 50 ∼ 100 µm 范围内时成反
比；近壁气泡的二次溃灭最大射流速度大于一次溃灭，二次溃灭的作用更加明显。超声参数对近壁气泡溃灭过
程存在较大影响，该研究为超声在医学上的应用提供了依据。
关键词：超声；微气泡；空化；溃灭；数值模拟
中图法分类号: O368 文献标识码: A 文章编号: 1000-310X(2020)03-0329-07
DOI: 10.11684/j.issn.1000-310X.2020.03.002

The effect of ultrasound on the collapse of near-wall microbubble

WANG Jianhang CHEN Taohou BAO Fubing WANG Yuebing

(College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou 310018, China)

Abstract: Deep understanding of the characteristics of near-wall microbubble collapse has an important
influence on targeted drug delivery and gene therapy. Based on the numerical simulation, the finite volume
method together with the volume of fluid (VOF) model were carried out to investigate the characteristics of
near-wall microbubble collapse. The effect of ultrasound on the collapse process is studied in detail. The results
show that the maximum efflux velocity of bubble collapse is proportional to the dimensionless parameter γ
of the near-wall distance in the range of 1.1 ∼ 1.6, proportional to the ultrasonic frequency in the range of
10 ∼ 60 Hz, and inversely proportional to the initial bubble radius in the range of 50 ∼ 100 µm. The maximum
velocity of bubble second-collapse is larger than that of the first collapse, which means the impact of the second-
collapse is more important. In this paper, the mechanism of near-wall microbubble collapse under ultrasonic
field is further revealed, which provides a basis for ultrasonic application in medical treatment.
Keywords: Ultrasound; Microbubble; Cavitation; Collapse; Numerical simulation

2019-08-07 收稿; 2019-11-28 定稿
国家重点研发计划项目 (2017YFB0603701), 国家自然科学基金项目 (11672284, 11602266)
∗
作者简介: 王舰航 (1995– ), 男, 山东青岛人, 硕士研究生, 研究方向: 功率超声, 超声空化, 超声换能器。
† 通信作者 E-mail: dingobao@cjlu.edu.cn