FINGERING INSTABILITY IN THIN WETTING FILMS
FINGERING INSTABILITY IN THIN WETTING FILMS
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DOI：
10.1103/physrevlett.62.1496
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发表时间：
1989-03-27
影响因子：
8.6
通讯作者：
SAFRAN, SA
中科院分区：
文献类型：
--
作者：
TROIAN, SM;WU, XL;SAFRAN, SA
本文报道了一种新的水动力不稳定性，这种不稳定性发生在薄湿膜的扩散边缘。一滴表面活性剂的水溶液放在被一层薄薄的水润湿的玻璃表面上，通过手指扩散，其速度和形状取决于周围水层的厚度和表面活性剂的浓度。两种流体可混溶，粘度差可忽略不计，排除了Saffman-Taylor不稳定性。我们认为马兰戈尼效应，即由表面张力梯度引起的流体流动，驱动了不稳定性。
We report on a new hydrodynamic instability which occurs at the spreading edge of a thin wetting film. A drop of aqueous surfactant solution placed on a glass surface moistened with a thin layer of water spreads by propagating fingers, whose velocity and shape depend on the thickness of the ambient water layer and on the surfactant concentration. The two fluids are miscible and show negligible viscosity difference, ruling out a Saffman-Taylor instability. We propose that the Marangoni effect, which is fluid flow induced by gradients in surface tension, drives the instability.