马朗戈尼效应
不稳定性
润湿
表面张力
肺表面活性物质
材料科学
粘度
下降(电信)
水溶液
薄膜
机械
热力学
复合材料
化学
纳米技术
物理
电信
物理化学
计算机科学
作者
Sandra M. Troian,Xinglong Wu,S. A. Safran
标识
DOI:10.1103/physrevlett.62.1496
摘要
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.
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