Couder Y, Fort E, Gautier C-H, Boudaoud A
Physique Expérimentale, UFR de Physique, Université Paris 7 Denis Diderot, 2 Place Jussieu, 75 252 Paris Cedex 05, France.
Phys Rev Lett. 2005 May 6;94(17):177801. doi: 10.1103/PhysRevLett.94.177801. Epub 2005 May 5.
When a drop of a viscous fluid is deposited on a bath of the same fluid, it is shown that its coalescence with this substrate is inhibited if the system oscillates vertically. Small drops lift off when the peak acceleration of the surface is larger than g. This leads to a steady regime where a drop can be kept bouncing for any length of time. It is possible to inject more fluid into the drop to increase its diameter up to several centimeters. Such a drop remains at the surface, forming a large sunk hemisphere. When the oscillation is stopped, the two fluids remain separated by a very thin air film, which drains very slowly (approximately 30 min). An analysis using lubrication theory accounts for most of the observations.
当一滴粘性流体滴落在相同流体的液池上时，研究表明，如果系统垂直振荡，液滴与该基底的聚结会受到抑制。当表面的峰值加速度大于重力加速度g时，小液滴会脱离。这会导致一种稳定状态，在这种状态下，液滴可以持续弹跳任意时长。可以向液滴中注入更多流体，将其直径增大到几厘米。这样的液滴会留在表面，形成一个大的下沉半球。当振荡停止时，两种流体被一层非常薄的气膜隔开，气膜排水非常缓慢（大约30分钟）。使用润滑理论进行的分析解释了大部分观测结果。
