流体动力漂移棘轮的可扩展性
Hydrodynamic drift ratchet scalability
AI总结：
本研究针对流体动力漂移棘轮的漂移特性受多参数影响的问题，通过数值模拟发现当Peclet数等无量纲群恒定时漂移速度与孔隙尺寸的比值不变，首次明确其动力学相似性标度参数，助力微纳流控分离器件研发。
摘要：
流体动力漂移棘轮中粒子的直线“漂移”由扩散运动与粒子-壁面流体动力相互作用共同产生，因此取决于粒子扩散系数、粒子尺寸、流体振荡的振幅与频率以及孔隙几何结构。通过数值模拟我们证明，若所有相关无量纲群（Peclet数、Strouhal数以及粒子与孔隙尺寸比）保持恒定，则漂移速度相对于孔隙尺寸在不同尺寸的漂移棘轮孔隙中保持恒定。这些结果首次明确了漂移棘轮实现动力学相似性的标度参数，从而为漂移棘轮的实验设计、制造与测试提供便利，并最终助力其成为商用微/纳流控分离器件。
英文摘要：
The rectilinear "drift" of particles in a hydrodynamic drift ratchet arises from a combination of diffusive motion and particle-wall hydrodynamic interactions, and is therefore dependent on particle diffusivity, particle size, the amplitude and frequency of fluid oscillation and pore geometry. Using numerical simulations, we demonstrate that the drift velocity relative to the pore size is constant across different sized drift ratchet pores, if all the relevant non-dimensional groups (Peclet number, Strouhal number and ratio of particle to pore size) remain constant. These results clearly indicate for the first time the scaling parameters under which the drift ratchet achieves dynamic similarity, and so facilitates design, fabrication and testing of drift ratchets for experiments and eventually as commercial micro/nano fluidic separation devices.
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