论文标题
在存在表面活性剂的情况下
Slip of submerged two-dimensional liquid-infused surfaces in the presence of surfactants
论文作者
论文摘要
使用数值模拟，我们研究了表面活性剂诱导的Marangoni应力对带有横向凹槽的液体注入液体表面（LIS）的有效滑动长度的影响。假定表面活性剂可溶于剪切表面的外部液体，并可以吸附到界面上。使用了两种不同的吸附模型：经典的Frumkin模型和一个更先进的模型，可以更好地描述微小浓度的表面张力下降。模拟表明，与以前研究的超疏水表面相比，LIS可能面临更严重的表面活性剂作用。为有效滑动长度构建分析模型，我们可以预测临界表面活性剂浓度，其滑动长度显着降低。该分析模型描述了LIS在统一框架上的吸附模型，如果正确调整了。我们还提高了对何时表面活性剂对流产生高度偏斜的界面浓度的理解 - 所谓的部分停滞帽制度。为了良好的近似，该状态只能存在于Marangoni数量和表面活性剂强度的特定表面活性剂浓度以下。
Using numerical simulations, we investigate the effects of Marangoni stresses induced by surfactants on the effective slip length of liquid-infused surfaces (LIS) with transverse grooves. The surfactants are assumed soluble in the external liquid shearing the surface and can adsorb onto the interfaces. Two different adsorption models are used: a classical Frumkin model and a more advanced model that better describes the decrease of surface tension for minuscule concentrations. The simulations show that LIS may face even more severe effects of surfactants than previously investigated superhydrophobic surfaces. Constructing an analytical model for the effective slip length, we can predict the critical surfactant concentration for which the slip length decreases significantly. This analytical model describes both adsorption models of LIS on a unified framework if properly adjusted. We also advance the understanding of when surfactant advection gives rise to highly skewed interfacial concentrations - the so-called partial stagnant cap regime. To a good approximation, this regime can only exist below a specific surfactant concentration given by the Marangoni number and the strength of the surfactants.
