搜索

x
中国物理学会期刊

超声场中空化泡对弹性粒子微流的影响

CSTR: 32037.14.aps.68.20191253

Effect of micro-bubble in ultrasonic field on microstreaming of elastic particle

CSTR: 32037.14.aps.68.20191253
PDF
HTML
导出引用
  • 从声散射基本理论出发, 考虑弹性粒子与空化泡之间耦合作用, 结合边界条件, 推导了弹性粒子外部声流分布, 得到了声微流的n = 0和n = 1模式近似表达式和粒子表面应力分布函数. 数值分析结果表明: 气泡和弹性粒子之间的耦合作用增加了粒子周围的微流分布与剪应力场分布, 特别是微流速度的切向分量. 随着两者间距与相对位置的距离增大, 粒子与气泡之间相互作用减弱, 粒子周围微流幅值减小; 当气泡处于共振状态时, 粒子周围的微流分布显著增强. 粒子表面剪应力场受粒子半径与声场频率影响, 当粒子半径与声场频率越大, 外部散射声强越强, 粒子表面剪应力幅值越大.

     

    In this paper, the interaction between elastic particle and cavitation bubble is considered, the expression of microstreaming velocity and shear stress around the elastic particle are derived by using the theory of acoustic scattering. Taking into account the two predominant modes of elastic particle: n = 0 mode and n = 1 mode, the effects of the distance and the ratio of the radius and the relative position on microstreaming distribution, and the effects of the particle radius and the driving frequency on shear stress distribution are investigated. It is demonstrated that the interaction can increase the amplitude of microstreaming velocity, especially the tangential component of microstreaming velocity, and the shear stress. As the distance between elastic particle and cavitation bubble increases, the interaction weakens and the amplitude of the microstreaming velocity around the elastic particle decreases. When the bubble is in resonance, the microstreaming velocity around the elastic particle is significantly enhanced. The shear stress of the particle is affected by the particle radius and the frequency of sound field. As the particle radius and the frequency of sound field are larger, the external scattering sound becomes stronger and the amplitude of shear stress on the surface of particles turns larger.

     

    目录

    /

    返回文章
    返回