纳米流的滑移边界条件是纳米流体动力学理论的关键组成部分。并且可以在纳米流体设备的设计和制造中发挥重要作用。在这次审查中,专注于纳米约束液体流动的滑移边界条件,我们首先总结了一些关于滑长的基本概念,包括滑长的定义和分类。然后,分析了不同界面性质对滑移长度的影响。在强亲水表面上,负滑移长度存在,并随外部驱动力的变化而变化。此外,取决于是否存在真实的滑动长度,表面粗糙度的幅值对有效滑移长度有不同的影响。表面纹理的组成,包括各向同性和各向异性纹理,也会影响有效滑移长度。最后,讨论了具有可调滑移长度的纳米流体的潜在应用,并解决了与纳米级流动系统的滑移边界条件相关的未来方向。
The slip boundary condition for nanoflows is a key component of nanohydrodynamics theory, and can play a significant role in the design and fabrication of nanofluidic devices. In this
review, focused on the slip boundary conditions for nanoconfined liquid flows, we firstly summarize some basic concepts about slip length including its definition and categories. Then, the effects of different interfacial properties on slip length are analyzed. On strong hydrophilic surfaces, a negative slip length exists and varies with the external driving force. In addition, depending on whether there is a true slip length, the amplitude of surface roughness has different influences on the effective slip length. The composition of surface textures, including isotropic and anisotropic textures, can also affect the effective slip length. Finally, potential applications of
nanofluidics with a tunable slip length are discussed and future directions related to slip boundary conditions for nanoscale flow systems are addressed.