Shark skin inspired low-drag microstructured surfaces in closed channel flow
Shark skin inspired low-drag microstructured surfaces in closed channel flow
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DOI：
10.1016/j.jcis.2012.10.061
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发表时间：
2013-03-01
影响因子：
9.9
通讯作者：
Bhushan, Bharat
中科院分区：
文献类型：
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作者：
Bixler, Gregory D.;Bhushan, Bharat
活生生的大自然是许多创新的灵感来源，并继续成为解决技术挑战的宝贵资源。快速游动的鲨鱼的皮肤引起了研究人员的兴趣，因为它的低阻力肋状结构适用于许多工程应用。在这项研究中，我们考察了肋片衬里封闭通道(矩形通道)的内部流动，因为它的影响比明渠外部流动要少得多。在一个实验装置和两种流体的情况下，这项研究考察了微结构肋骨的各个维度。实验参数包括波纹几何形状、流体速度(层流和湍流)、流体粘度、波纹组合、通道尺寸、润湿性和可扩展性。为了进行直接比较，制作了样品流动通道，以容纳不同流动条件下的多个样品与水和空气，其中阻力通过测量压降来表征。对结果进行了讨论，并给出了概念模型，表明了旋涡与肋片表面之间的相互作用。(C)2012 Elsevier Inc.保留所有权利。
Living nature is the inspiration for many innovations and continues to serve as an invaluable resource to solve technical challenges. Skin from fast swimming sharks intrigue researchers since its low-drag riblet structure is applicable to many engineering applications. In this study, riblet-lined closed channel (rectangular duct) internal flow was examined since its effect is less understood than with open channel external flow. With one experimental setup and two fluids, this study examines various dimensional aspects of microstructured riblets. Experimental parameters include riblet geometry, fluid velocity (laminar and turbulent flow), fluid viscosity, riblet combinations, channel size, wettability, and scalability. For direct comparison, the sample flow channel was fabricated to accommodate multiple samples with water and air in various flow conditions, where drag is characterized by measuring pressure drop. Results are discussed and conceptual models are shown suggesting the interaction between vortices and the riblet surfaces. (C) 2012 Elsevier Inc. All rights reserved.