Influence of slip on vortex-induced motion of a superhydrophobic cylinder
Influence of slip on vortex-induced motion of a superhydrophobic cylinder
复制标题
DOI：
10.1016/j.jfluidstructs.2013.04.006
复制
发表时间：
2013-10-01
影响因子：
3.6
通讯作者：
Rothstein, Jonathan P.
中科院分区：
文献类型：
--
作者：
Daniello, Robert;Muralidhar, Pranesh;Rothstein, Jonathan P.
卡西状态下的超疏水表面所产生的部分滑移边界条件已被证明能够减少表面摩擦阻力，并影响包括圆柱体和球体在内的涂层物体周围的流动。在本文中，我们研究了先前在超疏水圆柱体上观察到的涡旋脱落和分离的变化如何影响均方根升力以及在弹性安装圆柱体上引起的振动。研究了两个疏水性聚四氟乙烯圆柱体。第一个是光滑的，第二个是粗糙的，使其具有超疏水性并产生滑移。研究发现，滑移的存在使振动圆柱体的均方根升力和振幅降低了多达15%，而对弹性安装系统的阻力或固有频率没有可测量的影响。我们表明，观察到的减少是超疏水圆柱体上流体作用力降低的直接结果。(C) 2013爱思唯尔有限公司。保留所有权利。
The partial slip boundary condition produced by a superhydrophobic surface in the Cassie state has been shown capable of reducing skin friction drag as well as influencing the flow around coated bodies including cylinders and spheres. In this paper, we investigated how the changes in vortex shedding and separation previously observed on superhydrophobic cylinders affects the rms lift force and the resulting oscillations induced on an elastically mounted cylinder. Two hydrophobic polytetrafluoroethylene cylinders were studied. The first was smooth and the second was roughened to make it superhydrophobic and to induce slip. The presence of slip was found to decrease rms lift and amplitude of the oscillating cylinder by up to 15% with no measurable impact on drag or the natural frequency of the elastically mounted system. We show that the observed reductions are a direct result of reduced fluid forcing on the superhydrophobic cylinder. (C) 2013 Elsevier Ltd. All rights reserved.