Investigation on Air Drag Reduction and Stabilisation of Bionic Multiscale Wetting Gradient Surfaces

IF 1.8 4区工程技术 Q3 ENGINEERING, CHEMICAL

Lubrication Science Pub Date : 2024-09-12 DOI:10.1002/ls.1720

Jing Xu, Junyan Yang, GuiMing Zhang, Wissal Mahfoudi, Jiadi Lian

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Abstract

Considering the rapid liquid transport characteristics of bionic dragonfly wings, an experimental investigation into the stability and drag reduction properties of an air film on various textured surfaces is being conducted. The study examines the impact of different wetting gradient textures on the stability and drag reduction properties of air film. Experimental results demonstrate an enhanced fluid transport efficiency, resulting in a maximum drag reduction of 9.1%, attributed to the size effect of the multi‐scale structure of bionic dragonfly wings. Surfaces featuring wetting gradients exhibit increased stability of the air film within the texture and the ability to trap air bubbles. Based on a near‐wall flow two‐phase flow theory model, the simulation considers the morphological changes of the air film at structured interfaces and their influence on near‐wall flow characteristics. The results indicate that the drag reduction effect arise from the slippage effect between the internal vortex in the air film inside the texture and the flow field near the wall surface. The synergistic effect of near‐wall flow fields among multiple texture layers is evident. This interplay across different regions contributes to the sustained drag reduction within the near wall area.

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关于仿生多尺度润湿梯度表面减少空气阻力和稳定性的研究

考虑到仿生蜻蜓翅膀的快速液体传输特性，正在对各种纹理表面上气膜的稳定性和减阻特性进行实验研究。该研究探讨了不同润湿梯度纹理对气膜稳定性和阻力降低性能的影响。实验结果表明，由于仿生蜻蜓翅膀多尺度结构的尺寸效应，流体传输效率得到提高，最大阻力降低了 9.1%。具有润湿梯度的表面显示出纹理内气膜的稳定性和捕获气泡的能力都有所提高。模拟以近壁流两相流理论模型为基础，考虑了结构界面处气膜的形态变化及其对近壁流动特性的影响。结果表明，阻力减小效应源于纹理内气膜内部涡旋与近壁表面流场之间的滑动效应。近壁流场在多个纹理层之间的协同效应显而易见。这种不同区域的相互作用有助于持续降低近壁区域的阻力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Lubrication Science ENGINEERING, CHEMICAL-ENGINEERING, MECHANICAL

CiteScore

3.60

自引率

10.50%

发文量

审稿时长

6.8 months

期刊介绍： Lubrication Science is devoted to high-quality research which notably advances fundamental and applied aspects of the science and technology related to lubrication. It publishes research articles, short communications and reviews which demonstrate novelty and cutting edge science in the field, aiming to become a key specialised venue for communicating advances in lubrication research and development. Lubrication is a diverse discipline ranging from lubrication concepts in industrial and automotive engineering, solid-state and gas lubrication, micro & nanolubrication phenomena, to lubrication in biological systems. To investigate these areas the scope of the journal encourages fundamental and application-based studies on: Synthesis, chemistry and the broader development of high-performing and environmentally adapted lubricants and additives. State of the art analytical tools and characterisation of lubricants, lubricated surfaces and interfaces. Solid lubricants, self-lubricating coatings and composites, lubricating nanoparticles. Gas lubrication. Extreme-conditions lubrication. Green-lubrication technology and lubricants. Tribochemistry and tribocorrosion of environment- and lubricant-interface interactions. Modelling of lubrication mechanisms and interface phenomena on different scales: from atomic and molecular to mezzo and structural. Modelling hydrodynamic and thin film lubrication. All lubrication related aspects of nanotribology. Surface-lubricant interface interactions and phenomena: wetting, adhesion and adsorption. Bio-lubrication, bio-lubricants and lubricated biological systems. Other novel and cutting-edge aspects of lubrication in all lubrication regimes.