小固体缺陷诱发的涂膜流体动力减薄:时间最小厚度的证据

Alice Etienne-Simonetti, Frédéric Restagno, Isabelle Cantat, Emmanuelle Rio
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引用次数: 0

摘要

在涂层过程中,灰尘沉积会导致薄膜厚度不均匀,给工业生产带来严重问题。我们的研究利用垂直圆柱形纤维沉积在水平固体基底的硅油膜上,探讨了固体缺陷的影响。我们使用一台高光谱照相机,通过干涉测量法测量缺陷附近的薄膜厚度。正如在不同几何形状下的许多研究中所预测和观察到的那样,由于纤维底部形成的半月板所引起的毛细吸力,纤维周围出现了一个圆形凹槽。我们测量了凹槽处薄膜厚度随时间的变化。厚度先减小后增大,导致扰动长时间愈合。我们认为,当半月板达到平衡形状时,吸力就会停止,从而使扰动愈合。通过将几何分析与薄膜方程相结合,我们开发出了缩放定律,可以预测凹槽的最小厚度(我们称之为时间最小厚度)以及达到该最小厚度所需的时间。如果时间-最小厚度达到分子间作用力在愈合前开始发挥作用的厚度,凹槽厚度将停止减小,并由于分子间引力和斥力之间的竞争而饱和。在前一个缩放定律的基础上,我们提出了一个缩放定律,该定律考虑了薄膜的临界初始厚度,低于该厚度,分子间斥力将开始产生作用,这与我们的实验结果非常吻合。因此,这些结果为预测和预防涂层过程中的缺陷提供了有价值的见解,从而提高了各行业涂层产品的质量和可靠性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Hydrodynamic thinning of a coating film induced by a small solid defect: evidence of a time-minimum thickness
During coating processes, dust deposition can lead to an uneven thickness in the resulting film, posing significant problems in industrial processes. Our study explores the effects of solid defects using a vertical cylindrical fiber deposited on a silicone oil film coating a horizontal solid substrate. We use a hyperspectral camera to measure the film thickness by interferometry in the vicinity of the defect. As predicted and observed in many studies in various geometries, a circular groove appears around the fiber because of the capillary suction induced by the meniscus that grows at the bottom of the fiber. We measure the evolution of the thickness of the film at the groove over time. The thickness decreases before increasing again leading to the healing of the perturbation at long time. We propose that healing is due to the arrest of the suction when the meniscus reaches its equilibrium shape. By combining geometric analysis with the thin film equation, we have developed scaling laws that predict both the minimum thickness of the groove, that we call the time-minimum thickness, and the time required to reach this minimum. If the time-minimum thickness reaches the thickness at which intermolecular forces begin to play a role prior to healing, the thickness of the groove will stop decreasing and saturate due to the competition between drainage and repulsive intermolecular forces. Based on the previous scaling law, we developed a scaling law accounting for the critical initial thickness of the film below which the intermolecular repulsion will start to have an effect, which is in good agreement with our experiments. These results thus offer valuable insights into predicting and preventing defects in coating processes, thereby improving the quality and reliability of coated products in various industries.
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