Surfactant Effects on the Dynamics of Capillary Rise and Finger Formation in Square Capillaries,Langmuir

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Surfactant Effects on the Dynamics of Capillary Rise and Finger Formation in Square Capillaries
Langmuir ( IF 3.7 ) Pub Date : 2020-11-09 , DOI: 10.1021/acs.langmuir.0c01965
Rozeline Wijnhorst ₁ , Thijs Christiaan de Goede ₁ , Daniel Bonn ₁ , Noushine Shahidzadeh ₁

Affiliation

We investigate the influence of surfactants on capillary rise and corner flow in angular pores. We therefore study capillary rise for simple fluids and surfactant solutions, comparing square to cylindrical capillaries. We show that fingers start to form in the corners of the square capillaries when the capillary rise slows down before reaching the equilibrium height. The corner flow scales as t^1/3 and its quantitative understanding necessitates that the surface wettability is taken into account in terms of the liquid’s advancing contact angle on the capillary walls inside the corner. Adding surfactants to water greatly influences the corner flow in square capillaries: depending on the nature of the surfactant, the corner flow can be either suppressed completely due to autophobic effects or enhanced due to the presence of Marangoni stresses caused by a surface tension gradient inside the liquid fingers.

中文翻译：

表面活性剂对方毛细管中毛细血管上升和手指形成动力学的影响

我们调查了表面活性剂对角孔中毛细血管上升和拐角流动的影响。因此，我们将方形流体与圆柱形毛细管进行比较，研究简单流体和表面活性剂溶液的毛细管上升。我们显示当毛细管上升达到平衡高度之前变慢时，手指开始在方形毛细管的角部形成。角流量为t ^1/3由于其定量的理解，因此必须根据液体在拐角内毛细管壁上的前进接触角来考虑表面润湿性。在水中添加表面活性剂会极大地影响方形毛细管中的角流：根据表面活性剂的性质，角流可以由于自疏水效应而被完全抑制，或者由于存在于内部的表面张力梯度而引起的Marangoni应力而增强。液体手指。

更新日期：2020-11-25

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