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空气层对超疏水表面槽道流动减阻影响的数值研究。

Numerical investigation of the effect of air layer on drag reduction in channel flow over a superhydrophobic surface.

作者信息

Nguyen Hoai-Thanh, Lee Sang-Wook, Ryu Jaiyoung, Kim Minjae, Yoon Jaemoon, Chang Kyoungsik

机构信息

School of Mechanical Engineering, University of Ulsan, Ulsan, 44610, South Korea.

School of Mechanical Engineering, Korea University, Seoul, 02841, South Korea.

出版信息

Sci Rep. 2024 May 27;14(1):12053. doi: 10.1038/s41598-024-63070-3.

DOI:10.1038/s41598-024-63070-3
PMID:38802500
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11130193/
Abstract

This study investigates the effects of an air layer on drag reduction and turbulence dynamics in channel flow over a superhydrophobic surface (SHS). Employing the OpenFOAM platform, direct numerical simulation was conducted to investigate turbulent channel flow with an air layer over an SHS. The simulations, which take into account the interaction between water and air, analyze various parameters such as velocity distribution, drag reduction (DR), Reynolds stress, turbulent kinetic energy (TKE), and coherent structures near the water-air interface. The presence of an air layer significantly alters the velocity distribution, leading to higher velocities at the interface compared to simulations without the air layer. Notably, the thickness of the air layer emerges as an important factor, with larger thicknesses resulting in increased velocities and drag reduction. This study underscores the substantial impact of the air layer on TKE near the superhydrophobic surface, emphasizing its role in understanding and optimizing drag reduction. Furthermore, the nonlinear relationship between slip velocity, Q contours, and coherent structures near the SHS are investigated.

摘要

本研究调查了空气层对超疏水表面（SHS）上通道流中减阻和湍流动力学的影响。利用OpenFOAM平台，进行了直接数值模拟，以研究超疏水表面上带有空气层的湍流通道流。这些模拟考虑了水和空气之间的相互作用，分析了各种参数，如速度分布、减阻（DR）、雷诺应力、湍动能（TKE）以及水 - 气界面附近的相干结构。空气层的存在显著改变了速度分布，导致与没有空气层的模拟相比，界面处速度更高。值得注意的是，空气层的厚度成为一个重要因素，厚度越大，速度增加且减阻效果越明显。本研究强调了空气层对超疏水表面附近湍动能的重大影响，突出了其在理解和优化减阻方面的作用。此外，还研究了超疏水表面附近滑移速度、Q 等值线和相干结构之间的非线性关系。

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