Jeon Chanil, Jeong Hawoong, Jung Youngkyun
Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea.
Phys Rev E Stat Nonlin Soft Matter Phys. 2011 May;83(5 Pt 2):056324. doi: 10.1103/PhysRevE.83.056324. Epub 2011 May 23.
We study the behavior of pressure-driven flow in a cylindrical nanochannel patterned with different wettability using molecular dynamics simulations. We consider the flow perpendicular or parallel to the periodic stripes of wetting and nonwetting materials. For both geometries, we observe a sharp increase in the longitudinal velocity of the flow as wetting stripe width decreases, which is clearly distinguishable from the case of shear-driven flow. When the channel wall is spirally patterned with distinct wetting stripes, the transverse velocity of the flow is generated in the channel and its generation depends strongly on the degree of molecular ordering above the wetting stripes, which can be controlled by helical angle, wetting stripe width, the relative area of the wetting region, and the strength of the fluid-wall interaction.
我们使用分子动力学模拟研究了在具有不同润湿性图案的圆柱形纳米通道中压力驱动流的行为。我们考虑了垂直或平行于润湿和非润湿材料周期性条纹的流动。对于这两种几何形状，我们观察到随着润湿条纹宽度减小，流动的纵向速度急剧增加，这与剪切驱动流的情况明显不同。当通道壁用不同的润湿条纹螺旋图案化时，通道中会产生流动的横向速度，其产生强烈依赖于润湿条纹上方分子排列的程度，这可以通过螺旋角、润湿条纹宽度、润湿区域的相对面积以及流体 - 壁相互作用的强度来控制。
