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NUMERICAL SIMULATION AND EXPERIMENTAL STUDY OF DRAGREDUCING SURFACE OF A REAL shark skin

Journal of Hydrodynamics 2011年第2期23卷 204-211页

作者： ZHANG De-yuan LUO Yue-hao LI Xiang CHEN Hua-wei School of Mechanical Engineering and Automation Beihang University Beijing 100191 China

It is well known that shark skin surface can effectively inhabit the occurrence of turbulence and reduce the wall friction, but in order to understand the mechanism of drag reduction, one has to solve the problem of the turbulent flow on grooved-scale surface, and in that respect, the direct numerical simulation is an important tool. In this article, based on the real biological shark skin, the model of real shark skin is built through high-accurate scanning and data processing. The turbulent flow on a real shark skin is comprehensively simulated, and based on the simulation, the drag reduction mechanism is discussed. In addition, in order to validate the drag-reducing effect of shark skin surface, actual experiments were carried out in water tunnel, and the experimental results are approximately consistent with the numerical simulation.

关键词： numerical simulation experimental study biomimetic surface shark skin drag reduction mechanism

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Casting of microstructured shark skin surfaces and possible applications on aluminum casting parts

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China Foundry 2011年第1期8卷 62-65页

作者： Todor Ivanov Andreas Bührig-Polaczek Uwe Vroomen Foundry Institute of RWTH Aachen University

Within the project "Functional Surfaces via Micro-and Nanoscaled Structures" which is part of the Cluster of Excellence "Integrative Production Technology" established and financed by the German Research Foundation (DFG),an investment casting process to produce 3-dimensional functional surfaces down to a structural size of 1μm on near-net-shape-casting parts has been *** common way to realize functional microstructures on metallic surfaces is to use laser ablation,electro discharge machining or micro *** handicap of these processes is their limited *** approach of this project to raise the efficiency is to use the investment casting process to replicate microstructured surfaces by moulding from a laser-microstructured grand master *** main research objective deals with the investigation of the single process steps of the investment casting process with regard to the moulding *** results concerning making of the wax pattern,suitability of ceramic mould and core materials for casting of an AlSi7Mg0.3 alloy as well as the knock-out behavior of the shells are *** using of the example of an intake manifold of a gasoline race car engine,a technical shark skin surface has been realized to reduce the drag of the intake *** intake manifold consists of an air-restrictor with a defined inner diameter which is microstructured with technical shark skin *** this reason the inner diameter cannot be drilled after casting and demands a very high accuracy of the casting part.A technology for the fabrication and demoulding of accurate microstructured castings are *** factors of different moulding steps of the macroscopic casting part as well as the microscopic riblet structure have been examined as well.

关键词： investment casting microstructured surfaces shark skin

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Study on the Hydrophobic Property of shark-skin-Inspired Micro-Riblets

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Journal of Bionic Engineering 2014年第2期11卷 296-302页

作者： Danyang Zhao Qianqian Tian Minjie Wang Yifei Jin Key Laboratory for Precision & Non-Traditional Machining Technology of Ministry of Education Dalian University of Technology Dalian 116024 P. R. China

This paper aims to characterize the hydrophobic property of shark-skin-inspired riblets with potential engineering appli- cations. Based on the hydrophobic theory, a new hydrophobic model which is consistent with the special structure of shark-skin-inspired micro-riblets was proposed. Then, the contact angles of different droplets were measured by optical contact angle measuring device on the shark-skin-inspired micro-riblets and the smooth surface, respectively. The results show that the surface of micro-riblets possesses obvious hydrophobicity, and the actual contact angles of different droplets residing on the riblets decrease with the increase in the droplet volume. According to the new hydrophobic model and the measurement of contact angle, it was found that the arrangement and structure of the shark-skin-inspired micro-riblets significantly affect the surface hydrophobic property. Using the new hydrophobic model, the prediction error of contact angle can be less than 3% compared with the measured one. The research on hydrophobic property of biomimetic micro-riblets is proved to be necessary and important to well explain drag reduction and microbe-resistant property of micro-riblets.

关键词： hydrophobic property micro-riblet contact angle shark skin

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Drag-reduction of 3D printed shark-skin-like surfaces

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Friction 2019年第6期7卷 603-612页

作者： Wei DAI Masfer ALKAHTANI Philip RHEMMER Hong LIANG Department of Mechanical Engineering Texas A&M UniversityCollege StationTX 77843USA Institute for Quantum Science and Engineering(IQSE) Texas A&M UniversityCollege StationTX 77843USA Center for Quantum Optics and Quantum Informatics KACSTRiyadh 11442Saudi Arabia Department of Electrical and Computer Engineering Texas A&M UniversityCollege StationTX 77843USA

The marvels of the slippery and clean sharkskin have inspired the development of many clinical and engineering products, although the mechanisms of interfacial interaction between the sharkskin and water have yet to be fully understood. In the present research, a methodology was developed to evaluate morphological parameters and to enable studying the effects of scale orientation on the fluidic behavior of water. The scale orientation of a shark skin was defined as the angle between the ridges and fluid flow direction. Textured surfaces with a series orientation of scales were designed and fabricated using 3 D printing of acrylonitrile butadiene styrene(ABS). The fluid drag performance was evaluated using a rheometer. Results showed that the shark–skin-like surface with 90 degree orientation of scales exhibited the lowest viscosity drag. Its maximum viscosity reduction was 9%. A viscosity map was constructed based on the principals of fluid dynamic. It revealed that the drag reduction effect of a shark-skin-like surface was attributed to the low velocity gradient. This was further proven using diamond nitrogen-vacancy sensing where florescent diamond particles were distributed evenly when the velocity gradient was at the lowest. This understanding could be used as guidance for future surface design.

关键词： shark skin 3D printing textured surface drag reduction nitrogen vacancy

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