High-efficiency laser fabrication of drag reducing riblet surfaces on pre-heated Teflon
article
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.
Topics
TNO Identifier
866711
ISSN
20531591
Source
Materials Research Express, 6(6)
Publisher
Institute of Physics Publishing
Article nr.
65309
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