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Marangoni instability induced by evaporation in well-defined non-spherical sessile droplet

机译：明确定义的非球形无蒂液滴中蒸发引起的Marangoni不稳定性

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Marangoni instability in well-defined non-spherical sessile droplet of 0.65cSt silicone oil evaporating at constant contact line mode is investigated through a series of experiments. Droplets of typical regular geometries (such as triangular, square, pentagonal and elliptical) and exotic shapes (such as kidney and positive-positive curvature) are tested. Cell patterns of Benard-Marangoni instability are distributed along the azimuthal direction non-uniformly in the droplets. These cells always occur first at the region where the curvature of the three-phase contact line (k(cl)) is the largest and they do not fill the whole droplet at once. Different from that in spherical droplet, there is no such a steady state in the non-spherical droplets and these BM cells always drift from the lower k(cl) regions towards the higher ones. The influences of k(cl), the substrate temperature and the contact angle on the patterns of the Benard-Marangoni instability are analyzed. The critical contact angles for the onset of Marangoni instability are determined. (C) 2019 Elsevier Ltd. All rights reserved.
机译：通过一系列实验研究了在恒定接触线模式下蒸发的清晰定义的0.65cSt硅油非球形无蒂液滴中的Marangoni不稳定性。测试了典型规则几何形状（例如三角形，正方形，五边形和椭圆形）和特殊形状（例如肾脏和正曲率）的液滴。 Benard-Marangoni不稳定性的细胞模式在液滴中沿方位角方向不均匀分布。这些单元始终首先出现在三相接触线（k（cl））的曲率最大的区域，并且它们不会立即填充整个液滴。与球形液滴不同，在非球形液滴中没有这样的稳态，并且这些BM细胞总是从较低的k（cl）区域向较高的k（cl）区域漂移。分析了k（cl），衬底温度和接触角对Benard-Marangoni不稳定性图形的影响。确定了引起Marangoni不稳定性的临界接触角。 （C）2019 Elsevier Ltd.保留所有权利。

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