A PARAMETRIC STUDY ON DRAG REDUCTION USING ENGINEERED MICROTEXTURES IN VISCOUS LAMINAR FLOW
A PARAMETRIC STUDY ON DRAG REDUCTION USING ENGINEERED MICROTEXTURES IN VISCOUS LAMINAR FLOW
复制标题
DOI：
10.1615/tfec2019.mnt.027620
复制
发表时间：
2018-11
期刊：
影响因子：
--
通讯作者：
Pooyan Tirandazi;J. Healy;C. Hidrovo
中科院分区：
文献类型：
--
作者：
Pooyan Tirandazi;J. Healy;C. Hidrovo
几十年来，人们一直在研究减少摩擦的问题，以用于涉及内部和外部流动的许多工程应用。受不同植物和动物的自然表面结构的启发，表面的工程微纹理是减少阻力的有效方法之一。通过引入不同的纹理几何形状，靠近固体边界的流动行为可以被改变，从而被操纵以实现在表面上的减小的净阻力。尽管对这个问题进行了大量的研究，但大多数工作都集中在优化表面纹理，以最大限度地减少摩擦和最小化泵送功率的要求，很少注意到壁附近的流动和边界层的特性，特别是在层流状态。在这项工作中，我们调查的作用，微织构在低到中等雷诺数（Re）下的摩擦减少。我们进行了参数化研究的形状和尺寸的表面纹理和调查的边界层和流线的行为，以及局部剪切应力和压力分布沿着不同的流动条件下的固体-流体界面。这项工作的结果将提供一个指导方针，优化设计的人工纹理与许多工程应用，如用于热管理和生化诊断的微流体系统的重大影响。
The topic of friction reduction has been studied through the decades for numerous engineering applications that involve internal and external flows. Inspired by the natural surface structure of different plants and animals, engineered microtexturing of surfaces is one of the effective ways of reducing the drag. By introducing different texture geometries, the flow behavior close to the solid boundary can be altered and thus manipulated towards achieving a reduced net drag force on the surface. Despite considerable research on the subject, most works have concentrated on optimization of the surface texturing for maximizing the friction reduction and minimizing the pumping power requirements, and less attention has been paid to characterization of the flow and boundary layer in the vicinity of the wall, especially in laminar regime. In this work we investigate the role that microtexturing has on friction reduction under low to moderate Reynolds numbers (Re). We perform a parametric study on the shape and dimensions of the surface textures and investigate the boundary layer and streamline behavior as well as the local shear stress and pressure distribution along the solid-fluid interface under different flow conditions. The outcomes of this work will provide a guideline for optimal design of artificial textures with major implications for many engineering applications such as microfluidic systems used in thermal management and biochemical diagnostics.