Suppression of coalescence and of wetting: The shape of the interstitial film
Suppression of coalescence and of wetting: The shape of the interstitial film
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DOI：
10.1063/1.869471
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发表时间：
1997-09-01
影响因子：
4.6
通讯作者：
Carotenuto, L
中科院分区：
文献类型：
--
作者：
DellAversana, P;Tontodonato, V;Carotenuto, L
用激光干涉法测量了非凝聚液体之间以及液滴与固体表面之间的间隙气膜的形状。利用其他光学技术来揭示薄膜的轮廓和绝对厚度及其动力学行为。特别是，在液滴停留在固体表面的情况下，用角度移动法测量了薄膜的厚度；进一步的基于反射仪的实验表明，在稳定和随时间变化的界面条件下，都可以实现稳定的不合并。利用光偏转技术结合图像分析来检测薄膜不稳定的特征。显式计算了相关的傅里叶谱。借助能够模拟薄膜产生的干涉条纹图案的特定数值代码，解释了确定薄膜厚度的过程。本文的结果从润滑理论的角度进行了解释，利用实验数据作为边界条件，使人们可以解开界面上的应力平衡方程和润滑方程，并只求解后者。(C)1997年美国物理研究所。
The shape of the interstitial air film between noncoalescing liquids and between a drop and a solid surface is detected by means of laser interferometry. Alternative optical techniques are exploited to reveal the film profile and absolute thickness and its dynamical behavior. In particular, the thickness of the film is measured, by means of an angle shift method, in the case of a drop resting on a solid surface; further experiments, based upon reflectometry, show that stable noncoalescence may be realized both under steady and time-dependent conditions of the interfaces. A light deflection technique, coupled with image analysis, is exploited to detect the features of the film unsteadiness. The related Fourier spectra are explicitly calculated. The procedure for the determination of the film thickness is explained with the aid of a specific numerical code that is able to simulate the interference fringe patterns generated by thin films. The results presented herewith are explained in terms of theory of lubrication, exploiting the experimental data as boundary conditions that allow one to uncouple the stress-balance equations at the interfaces and the lubrication equations and solve only the latter ones. (C) 1997 American Institute of Physics.