Drag reduction using metallic engineered surfaces with highly ordered hierarchical topographies: nanostructures on micro-riblets
| Autor: | Ryung Shin, Changsu Park, Myungki Jung, Taekyung Kim, Jinhyung Lee, Shinill Kang |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Nanostructure
Materials science Piping Fabrication General Physics and Astronomy Nanotechnology 02 engineering and technology Surfaces and Interfaces General Chemistry Slip (materials science) 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 010305 fluids & plasmas Surfaces Coatings and Films Corrosion law.invention law Drag 0103 physical sciences Thermal Photolithography 0210 nano-technology |
| Zdroj: | Applied Surface Science. 367:147-152 |
| ISSN: | 0169-4332 |
| DOI: | 10.1016/j.apsusc.2016.01.161 |
| Popis: | Durable drag-reduction surfaces have recently received much attention, due to energy-saving and power-consumption issues associated with harsh environment applications, such as those experienced by piping infrastructure, ships, aviation, underwater vehicles, and high-speed ground vehicles. In this study, a durable, metallic surface with highly ordered hierarchical structures was used to enhance drag-reduction properties, by combining two passive drag-reduction strategies: an air-layer effect induced by nanostructures and secondary vortex generation by micro-riblet structures. The nanostructures and micro-riblet structures were designed to increase slip length. The top–down fabrication method used to form the metallic hierarchical structures combined laser interference lithography, photolithography, thermal reflow, nanoimprinting, and pulse-reverse-current electrochemical deposition. The surfaces were formed from nickel, which has high hardness and corrosion resistance, making it suitable for use in harsh environments. The drag-reduction properties of various metal surfaces were investigated based on the surface structure: a bare surface, a nanostructured surface, a micro-riblet surface, and a hierarchically structured surface of nanostructures on micro-riblets. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect