Inducing drop to bubble transformation via resonance in ultrasound.
Inducing drop to bubble transformation via resonance in ultrasound.
复制标题
通过超声波共振诱导液滴到气泡的转变
DOI：
10.1038/s41467-018-05949-0
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发表时间：
2018-09-11
影响因子：
16.6
通讯作者：
Geng X
中科院分区：
文献类型：
--
作者：
Zang D;Li L;Di W;Zhang Z;Ding C;Chen Z;Shen W;Binks BP;Geng X
气泡的形成在与矿物浮选、食品、化妆品和材料有关的工业中起着重要作用，这需要额外的能量来产生液-气界面。一个自然观察到的事实是，由于表面张力的影响，气泡膜倾向于收缩以减小其表面积。在这里，我们展示了一个“反向”的现象，即通过声共振使用声悬浮液滴转化为气泡。一旦由屈曲膜封装的腔体的体积达到临界值V*，则发生共振并触发突然膨胀，导致形成封闭的气泡。实验和仿真结果都表明，V* 随着声频率的增加而减小，这与声共振理论相吻合。结果提供了启发性的见解声共振，并强调其在操纵屈曲的流体-流体界面的作用，提供了一个参考，以制造独特的核-壳状材料。气泡倾向于破裂并收缩成液滴。在这里，作者展示了如何通过声学悬浮液滴并利用它们的屈曲形成气泡来将液滴变成气泡。
Bubble formation plays an important role in industries concerned with mineral flotation, food, cosmetics, and materials, which requires additional energy to produce the liquid–gas interfaces. A naturally observed fact is, owing to the effect of surface tension, a bubble film tends to retract to reduce its surface area. Here we show a “reverse” phenomenon whereby a drop is transformed into a bubble using acoustic levitation via acoustic resonance. Once the volume of the cavity encapsulated by the buckled film reaches a critical value V*, resonance occurs and an abrupt inflation is triggered, leading to the formation of a closed bubble. Experiments and simulations both reveal that V* decreases with increasing acoustic frequency, which agrees well with acoustic resonance theory. The results afford enlightening insights into acoustic resonance and highlight its role in manipulating buckled fluid–fluid interfaces, providing a reference for fabricating unique core–shell-like materials. Bubbles tend to burst and retract into droplets. Here the authors show how a droplet can be turned into a bubble by levitating the droplets acoustically and exploiting their buckling to form gas bubbles.
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