非球形效应对强声场中次Bjerknes力的影响

发布时间：2018-07-15 12:59

【摘要】：考虑了非球形气泡在声场中的形状振动,推导了非球形气泡和球形气泡之间的次Bjerknes力方程,数值模拟了声场中非球形气泡和球形气泡之间的次Bjerknes力和两个球形气泡之间的次Bjerknes力,并对非球形气泡和球形气泡之间的次Bjerknes力的影响因素进行了分析讨论.研究结果表明:当驱动声压振幅大于非球形气泡的Black阈值且又能使得非球形气泡稳定振动时,在第一个声驱动周期内,非球形气泡和球形气泡之间的次Bjerknes力和两个球形气泡的次Bjerknes力方向差异较大,在大小上是两个球形气泡次Bjerkens力的数倍,且有着更长的作用距离.非球形气泡和球形气泡之间的次Bjerknes力取决于非球形气泡的形状模态、两个气泡初始半径的比值、驱动声压振幅、气泡间距和两个气泡的相对位置.
[Abstract]:Considering the shape vibration of a non-spherical bubble in a sound field, the secondary Bjerknes force equation between a non-spherical bubble and a spherical bubble is derived. The secondary Bjerknes force between a non-spherical bubble and a spherical bubble in a sound field and a secondary Bjerknes force between two spherical bubbles are numerically simulated, and the factors affecting the secondary Bjerknes force between a non-spherical bubble and a spherical bubble are analyzed and discussed. The results show that when the amplitude of the driving sound pressure is larger than the black threshold of the non-spherical bubble and the vibration of the non-spherical bubble can be stabilized, during the first acoustic driving period, The secondary Bjerknes force between the non-spherical bubble and the spherical bubble is different from that of the secondary Bjerknes force of the two spherical bubbles. It is several times larger than the secondary Bjerkens force of the two spherical bubbles and has a longer acting distance. The secondary Bjerknes force between a non-spherical bubble and a spherical bubble depends on the shape mode of the non-spherical bubble, the ratio of the initial radius of the two bubbles, the amplitude of the driving sound pressure, the bubble spacing and the relative position of the two bubbles.
【作者单位】：陕西师范大学陕西省超声学重点实验室;宁夏师范学院物理与电子信息工程学院纳米结构及功能材料工程技术研究中心;
【基金】：国家自然科学基金(批准号:11374200,11674206)资助的课题~~
【分类号】：O42

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