Drag reduction using metallic engineered surfaces with highly ordered hierarchical topographies: nanostructures on micro-riblets

Kim, Tae‐Kyung; Shin, Ryung; Jung, Mun Yhung; Lee, Jinhyung; Park, Changsu; Kang, Shinill

doi:10.1016/j.apsusc.2016.01.161

Cited by 26 publications

(18 citation statements)

References 30 publications

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“…35(a)). In another attempt, a hierarchical texture was fabricated on Ni, containing nanostructures on microriblets using laser interference lithography, nanoimprinting and pulse-reverse-current electrochemical deposition [156]. Similarly, use of a wire EDM process was reported to fabricate a simplified micro-riblet pattern [214].…”

Section: Commentsmentioning

confidence: 99%

“…The micro-riblet patterns discussed above were tested for their drag reduction properties under various conditions. The metallic hierarchical textures fabricated using laser interference lithography were tested in a turbulent flow regime and showed a maximum drag reduction of 36% compared to an untextured surface [156]. Similarly, the 3-D printed riblets have demonstrated about an 8.7% drag reduction in low speed conditions [273].…”

Section: Commentsmentioning

confidence: 99%

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Bio-inspired textures for functional applications

et al. 2018

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Introduction: bio-inspired surface textures-nature's tool for delivering functional surfaces 'It is not the strongest of the species that survives, nor the most intelligent, but the most responsive to change,' said Charles Darwin. Survival of the fittest is a famous phrase of Herbert Spencer, which describes the idea that, in nature, there is a competition to survive and reproduce. Survival and change are two critical terms, especially as species on earth over millions of years are in continuous combat with changing environments. These environments are typically harsh for organisms to live in, but despite these difficulties organisms have survived and thrived by building harmonic ecosystems within divergent environments including marshy and muddy; deep cold and snowy; hot, dry and desert; and more. Living organisms interact and interface with their surroundings through their outer layers, their surfaces which have adapted and evolved with novel but simple designs and functional properties in this process of combat and survival.The surface (and sub-surface) of an organism, also called skin, is an important interface between an organism and its environment, serving a mission critical role in the process of adaptation and survival. Skin surfaces interact with aggressive environmental factors such as temperature, moisture, abrasive agents such as sand and ice, pH, bacteria and viruses, light, mating abrasive or super smooth surfaces, etc. and their combinations. To combat these aggressive factors, skins have evolved unique design architectures that achieve multifunctional properties including (but not limited to) adhesion, hydrophobicity, hydrophilicity, thermal-management, anti-reflection, structural colors, and spherical vision as highlighted in Fig. 1.The skins of organisms, from here onwards called surfaces, deliver these environment-specific properties by combining textures and material chemistries to exploit classical laws of physics to achieve superior functional properties. The term surface texture captures various facets of a construct including the repetitive arrangement of features, the various shapes and sizes of features (in 2-D and 3-D), and the hierarchical distribution of quasi-periodic connected structures in a multi-dimensional space CIRP Annals -Manufacturing Technology xxx (2018) xxx-xxx

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Section: Commentsmentioning

confidence: 99%

Section: Commentsmentioning

confidence: 99%

Bio-inspired textures for functional applications

et al. 2018

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“…The relative permittivity is carried out by the substrate of the patch and the thickness of the patch can be represented as t. The frequency range of patch antenna design is 1GHz. The power radiated and received from the antenna is depends on the radial distance and angular position [26][27][28][29][30]. The patch antenna length can be evaluated by [31][32][33],…”

Section: Designmentioning

confidence: 99%

Conformal Antenna for Aerodynamic Drag Reduction in Airborne System

Namrutha¹,

Raaza²,

Ramesh³

2018

IJET

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The conformal antenna receives more consideration towards the coverage augmentation of contemporary wireless communication systems. The foremost unprejudiced of conformal antenna is to reduce aerodynamic drag in aircraft. Consequently designing frequency reconfigurable conformal antenna has become a key concern in the airborne system. This article reviews the state-of-the-art conformal antenna design by considering the challenges of reducing the aerodynamic drag in the airborne applications. Microstrip patch antennas represent compact antenna that offer a conformal nature and capability of equipped integration with communication system. In this work, microstrip patch antenna is designed for airborne system for drag reduction. The hybrid particle swarm and cuckoo search optimization algorithm is utilized for the length and width. Then the algorithm values are used for the calculation of effective length. The performance of the proposed method is compared with hybrid artificial neural network and firefly, genetic algorithm and analyzed.

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“…They results demonstrated that the attack angle is not negligible for drag reduction, and released mucus in acceleration can produce the important impact on drag reduction effect and also shark skin surfaces possess many advantages compared with the simplified and straight microgrooved surfaces. A durable metallic surfaces by superhydrophobic nanostructures coating and mirco riblet structures is fabricated by Kim et al (2016). The results showed a maximum drag reduction of 36% within the turbulent region.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Friction Drag Reduction of Superhydrophobic Surfaces in Closed Channel Flow

Monfared¹,

Alidoostan²,

Saranjam³

2019

JAFM

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Due to the importance of copper and its alloys in marine applications, the main objective of this research is to provide a simple, effective and low cost manufacturing approach to fabricate a superhydrophobic riblet copper surface with high drag reduction capability in laminar and turbulent flow regimes. Therefore, the riblets are produced by wire cut technique on the copper substrate and then by using a wet chemical method, a superhydrophobic coating is produced on the riblet surface. A pressure drop measurement system consists; pump, closed channel flow with a fabricated surfaces on the lower wall, connections and pressure drop transmitter is employed to measure the pressure drop in the close channel flow, for Reynolds number from 300 to 2769, in order to evaluate the ability of the fabricated surface to reduce the friction drag. The experimental results revealed that combining the abilities of the riblet and superhydrophobic surfaces increases the surface's ability to reduce friction drag. In addition, the riblet surface and superhydrophobic riblet surface on average decreased the friction drag by 10.33% and 42.65% correspondingly in water flow ranging from laminar to turbulent flow regime. Finally, according to the experimental results, the drag reduction performance of riblet surface is improved from 18.9% to 56.9% after superhydrophobic coating.

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Drag reduction using metallic engineered surfaces with highly ordered hierarchical topographies: nanostructures on micro-riblets

Cited by 26 publications

References 30 publications

Bio-inspired textures for functional applications

Bio-inspired textures for functional applications

Conformal Antenna for Aerodynamic Drag Reduction in Airborne System

Experimental Study on the Friction Drag Reduction of Superhydrophobic Surfaces in Closed Channel Flow

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