论文标题
阐明由表面声波触发的无孔滴的振荡不稳定
Elucidating the oscillation instability of sessile drops triggered by surface acoustic waves
论文作者
论文摘要
无柄滴的振荡不稳定在表面声波（SAW）功率的数字微流体中无处不在。然而，由于流体动力学，声学和毛细血管之间的相互作用，尚未阐明这些现象的物理学。我们通过将高速成像与压力测量相结合来破坏不稳定。我们用来自光学力学启发的模型合理化了观察到的行为，该模型将锯内振荡的声学模式伴随着通过振幅调制和延迟的辐射压力反馈来激发的驱动内声学模式。
The oscillation instability of sessile drops is ubiquitous in surface acoustic wave (SAW)-powered digital microfluidics. Yet, the physics underlying these phenomena has not been elucidated owing to the interplay between hydrodynamics, acoustics and capillarity. We decipher the instability by combining high-speed imaging with pressure measurements. We rationalize the observed behaviour with a model inspired from optomechanics, which couples an intracavity acoustic mode excited by the SAW to a surface deformation eigenmode through amplitude modulation and delayed radiation pressure feedback.
