Lifetime of a bouncing droplet
Lifetime of a bouncing droplet
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DOI：
10.1103/physreve.76.056311
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发表时间：
2007-11-01
影响因子：
2.4
通讯作者：
Dorbolo, S.
中科院分区：
文献类型：
--
作者：
Terwagne, D.;Vandewalle, N.;Dorbolo, S.
当液滴轻轻地放在同一种液体的表面时，它会在聚结之前静止片刻。通过在液滴下方注入新鲜空气，可以延迟并有时抑制聚结。当浴槽表面垂直振荡时，可能会发生这种情况。在这种情况下，液滴基本上在界面上反弹。液滴的寿命已被研究相对于的振幅和频率的激励。当加速度增加时，寿命减少。利用低压钠灯照射系统时得到的干涉条纹，研究了液滴与熔池之间的气膜厚度。此外，为了证明变形和轨迹之间的相位偏移，已经记录了形状演变和液滴质心的运动。寿命短与空气膜厚度小以及变形最大值与质量中心垂直位置最小值之间的大相位偏移相关。
When a droplet is gently laid onto the surface of the same liquid, it stays at rest for a moment before coalescence. The coalescence can be delayed and sometimes inhibited by injecting fresh air under the droplet. This can happen when the surface of the bath oscillates vertically. In this case the droplet basically bounces on the interface. The lifetime of the droplet has been studied with respect to the amplitude and the frequency of the excitation. The lifetime decreases when the acceleration increases. The thickness of the air film between the droplet and the bath has been investigated using interference fringes obtained when the system is illuminated by low-pressure sodium lamps. Moreover, both the shape evolution and the motion of the droplet center of mass have been recorded in order to evidence the phase offset between the deformation and the trajectory. A short lifetime is correlated to a small air-film thickness and to a large phase offset between the maximum of deformation and the minimum of the vertical position of the center of mass.