期刊
JOURNAL OF FLUID MECHANICS
卷 935, 期 -, 页码 -出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/jfm.2021.1089
关键词
bubble dynamics
资金
- LabEx CeLyA of the University of Lyon (Lyon Acoustics Center)
- [ANR-10-LABX-0060 / ANR-11-IDEX-0007]
This experimental study investigates the generation of acoustic microstreaming induced by different shape modes, finding that different shape modes result in distinct flow patterns.
Acoustic microstreaming is a nonlinear response of a fluid that undergoes high-amplitude acoustic stimulation and tends to viscously absorb it. The present experimental study investigates the generation of acoustic microstreaming induced by an oscillating wall-attached bubble undergoing nonspherical shape modes. From a microscope top view, the formation of particular flow signatures is explored for the main classes of spherical harmonics Ynm(theta,?)Ynm(theta,?): zonal (m=0 < nm=0 < n), sectoral (n=m > 0n=m > 0) and tesseral (0 < m < n0 < m < n) oscillation. The microstreaming induced by a bubble animated by a sectoral mode alone reveals a pattern characterized by a 4n4n-lobe flower shape. Tesseral modes give rise to 4m-lobe flower-shaped patterns. Finally, when sectoral and zonal modes coexist, two kinds of pattern stand out: 2n2n-lobe flower shape and nn-pointed star shape. The preferential emergence of one or another streaming pattern is discussed on the basis of the amplitude and phase shift between both shape modes.
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