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High-efficiency laser fabrication of drag reducing riblet surfaces on pre-heated Teflon

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Author: Žemaitis, A. · Mikšys, J. · Gaidys, M. · Gecys, P. · Gedvilas, M.
Type:article
Date:2019
Publisher: Institute of Physics Publishing
Source:Materials Research Express, 6, 6
Identifier: 866711
doi: doi:
Article number: 65309
Keywords: Direct laser ablation · Drag reduction · Pre-heated · PTFE · Riblets · Shark-skin-like · Teflon · Ablation · Drag reduction · Friction · Laser ablation · Ultraviolet lasers · Conventional lasers · High-efficiency lasers · Laser ablation technique · Polytetrafluoroethylene · Sample temperature · Shark skins · Polytetrafluoroethylenes

Abstract

Bio-inspired surfaces are able to decrease friction with fluids and gases. The most recognizable are shark-skin-like riblet surface structures. Such bio-inspired surfaces can be formed by the laser ablation technique. In this work, bio-inspired riblet surfaces with grooves were formed using picosecond ultraviolet laser ablation on pre-heated polytetrafluoroethylene (PTFE) at various sample temperatures. The ablation of hot PTFE was found to be 30% more efficient than the conventional laser structuring at the room temperature. The friction of structured PTFE surfaces with the flowing air was investigated by using drag a measurement setup. Results show the decrease of friction force by 6% with dimensionless riblet spacing around 14-20. © 2019 IOP Publishing Ltd.