Molecular Dynamics Study of Friction Reduction of Two-Phase Flows on Surfaces Using 3D Hierarchical Nanostructures,The Journal of Physical Chemistry C

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Molecular Dynamics Study of Friction Reduction of Two-Phase Flows on Surfaces Using 3D Hierarchical Nanostructures
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2019-11-05 , DOI: 10.1021/acs.jpcc.9b06848
O. Saleki ₁ , A. Moosavi ₁ , S. K. Hannani ₁

Affiliation

The use of superhydrophobic surfaces is one the most promising methods for reducing the friction and increasing the flow rate in fluid transfer systems. Because in such systems the surface structure plays a key role, in this study, we explore the performance of the hierarchical nanostructures. These nanostructures are inspired by the superhydrophobic surface of the lotus leaf. We consider a flow between two walls with hierarchical nanostructures and simulate the system via the molecular dynamics method. The size of the nanostructures and the distance between them have been studied to find whether a design with a maximum flow rate exists. The nanostructures have two parts, a bigger part on the wall which is a half-sphere and a smaller part which is a cylinder on top of the bigger part. Twenty-four different nanostructures are placed on the two walls and three different distances are selected. The effect of wall materials was also examined by considering four different materials, namely, carbon, silicon, and two other hypothetical materials. In the second part of this study, a two-phase flow consisting of water and air have been simulated to study the effect of the trapped airs in the performance. The results show that in the carbon-made walls for the design with minimum pressure drop, the slip length increases by 97% and the flow rate increases by 200%. The increases for silicon-made walls and similar sizes are 99 and 183%, for the slip length and the flow rate, respectively. The slip length for carbon-made walls is almost 3 times larger than the silicon-made walls. Finally, by increasing the air fraction up to 30% in the carbon-made walls, the slip length increases by 430% and the flow rate increases by 310%, and also, for the silicon-made walls, the increases are 380 and 360% for the slip length and the flow rate, respectively.

中文翻译：

使用3D分层纳米结构降低表面两相流摩擦的分子动力学研究

使用超疏水表面是减少流体传输系统中的摩擦并增加流速的最有前途的方法之一。因为在这样的系统中表面结构起着关键作用，所以在这项研究中，我们探索了分层纳米结构的性能。这些纳米结构的灵感来自荷叶的超疏水表面。我们考虑了具有纳米结构的两壁之间的流动，并通过分子动力学方法对系统进行了模拟。已经研究了纳米结构的尺寸和它们之间的距离，以发现是否存在具有最大流速的设计。纳米结构有两个部分，壁上的较大部分是半球形，较小的部分是圆柱体，位于较大部分的顶部。在这两个壁上放置了二十四个不同的纳米结构，并选择了三个不同的距离。还通过考虑四种不同的材料（即碳，硅和另外两种假设的材料）来检查墙材料的效果。在本研究的第二部分中，模拟了由水和空气组成的两相流，以研究滞留空气对性能的影响。结果表明，在具有最小压降的设计的碳制墙中，滑移长度增加了97％，流量增加了200％。对于滑动长度和流速，硅制壁和类似尺寸的壁的增加分别为99％和183％。碳制墙的滑移长度几乎是硅制墙的3倍。最后，

更新日期：2019-11-05

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