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首页> 外文期刊>Bulletin of the American Physical Society >APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - Drag reduction in silica nanochannels induced by graphitic wall coatings.
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APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - Drag reduction in silica nanochannels induced by graphitic wall coatings.

机译：APS-流体动力学APS部门第70届年会-事件-石墨壁涂层引起的二氧化硅纳米通道减阻作用。

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摘要

Transport of water in hydrophilic nanopores is of significant technological and scientific interest. Water flow through hydrophilic nanochannels is known to experience enormous hydraulic resistance. Therefore, drag reduction is essential for the development of highly efficient nanofluidic devices. In this work, we propose the use of graphitic materials as wall coatings in hydrophilic silica nanopores. Specifically, by conducting atomistic simulations, we investigate the flow inside slit and cylindrical silica channels with walls coated with graphene (GE) layers and carbon nanotubes (CNTs), respectively. We develop realistic force fields to simulate the systems of interest and systematically, compare flow rates in coated and uncoated nanochannels under different pressure gradients. Moreover, we assess the effect that GE and CNT translucencies to wettability have on water hydrodynamics in the nanochannels. The influence of channel size is investigated by systematically varying channel heights and nanopore diameters. In particular, we present the computed water density and velocity profiles, volumetric flow rates, slip lengths and flow enhancements, to clearly demonstrate the drag reduction capabilities of graphitic wall coatings.
机译：亲水性纳米孔中水的运输具有重大的技术和科学意义。已知流过亲水性纳米通道的水会遇到巨大的水力阻力。因此，减阻对于开发高效的纳米流体装置至关重要。在这项工作中，我们建议在亲水性二氧化硅纳米孔中使用石墨材料作为墙面涂料。具体来说，通过进行原子模拟，我们研究了狭缝和圆柱二氧化硅通道内部的流动，通道的壁分别涂覆有石墨烯（GE）层和碳纳米管（CNT）。我们开发了逼真的力场来模拟感兴趣的系统，并系统地比较在不同压力梯度下涂覆和未涂覆的纳米通道中的流速。此外，我们评估了GE和CNT对润湿性的半透明性对纳米通道中水动力的影响。通过系统地改变通道高度和纳米孔直径来研究通道尺寸的影响。特别是，我们介绍了计算出的水密度和速度曲线，体积流量，滑移长度和流动增强，以清楚地证明石墨墙涂料的减阻能力。

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