Nanoprobe Laboratory for Bio- & Nanotechnology and Biomimetics (NLB(2)), The Ohio State University, 201 W. 19th Avenue, Columbus, OH 43210-1142, USA; School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, PR China.
Nanoprobe Laboratory for Bio- & Nanotechnology and Biomimetics (NLB(2)), The Ohio State University, 201 W. 19th Avenue, Columbus, OH 43210-1142, USA.
J Colloid Interface Sci. 2013 Feb 15;392:15-26. doi: 10.1016/j.jcis.2012.09.082. Epub 2012 Oct 13.
Drag reduction in micro/nanofluidic systems is an important issue. The effect of boundary slip and electrical double layer (EDL) induced by surface charge on the pressure-driven flow in a micro/nanochannel has been widely studied. However, change in electrical conductivity as a result of ionic redistribution caused by surface charge, which can affect the EDL-induced electrical force exerted on the flow, is often neglected. In addition, the effect of surface charge on the slip length is not considered. In this work, a model incorporating the effect of surface charge on electrical conductivity and slip length was developed to investigate the effect of boundary slip and EDL induced by surface charge on the volumetric flow rate and skin friction coefficient. The underlying mechanisms for the results regarding the effect of slip and surface charge on the flow were analyzed.
在微/纳流系统中减少阻力是一个重要问题。表面电荷引起的边界滑移和双电层（EDL）对微/纳米通道内压力驱动流的影响已经得到了广泛的研究。然而，由于表面电荷引起的离子重新分布导致的电导率的变化，这会影响作用于流动的 EDL 诱导电场力，通常会被忽略。此外，表面电荷对滑移长度的影响也未被考虑。在这项工作中，我们开发了一个模型，该模型考虑了表面电荷对电导率和滑移长度的影响，以研究边界滑移和表面电荷引起的 EDL 对体积流量和表面摩擦系数的影响。分析了滑移和表面电荷对流动影响的结果的潜在机制。
