FINGERING INSTABILITY OF THIN SPREADING FILMS DRIVEN BY TEMPERATURE-GRADIENTS
FINGERING INSTABILITY OF THIN SPREADING FILMS DRIVEN BY TEMPERATURE-GRADIENTS
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DOI：
10.1038/346824a0
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发表时间：
1990-08-30
期刊：
影响因子：
64.8
通讯作者：
CARLES, P
中科院分区：
文献类型：
--
作者：
CAZABAT, AM;HESLOT, F;CARLES, P
液体薄膜的扩散动力学对许多技术和生物过程都很重要，包括三次采油、涂覆过程、微芯片的形成和保护以及生物细胞的相互作用。在毛细力作用下，液体薄膜的自发扩散通常是一个缓慢的过程。施加的力——重力或离心力，或表面剪应力——可以用来更快地推动扩散1,2。最近的实验和理论研究表明，在所有这些强制扩散的情况下，液体锋面都经历了指指不稳定性。在这里，我们报告了另一个这种不稳定驱动流的例子，这次是由马兰戈尼效应引起的，其中温度梯度引起表面张力梯度，从而驱动扩散过程。
THE dynamics of spreading of thin liquid films are important to many technological and biological processes, including tertiary oil recovery, coating processes, the formation and protection of microchips and biological cell interactions. The spontaneous spreading of thin liquid films under capillary forces alone is typically a slow process. An applied force—gravitational or centrifugal, or a surface shear stress—can be used to drive the spreading more quickly1,2. Recent experimental3,4and theoretical5studies have revealed that in all of these cases of forced spreading, the liquid front undergoes a fingering instability. Here we report another example of such unstable driven flow, this time caused by the Marangoni effect6, in which a temperature gradient induces a gradient of surface tension which drives the spreading process.