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

article




Žemaitis, A.

Mikšys, J.

Gaidys, M.

Gecys, P.

Gedvilas, M.
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


















Direct laser ablationDrag reductionPre-heatedPTFERibletsShark-skin-likeTeflonAblationDrag reductionFrictionLaser ablationUltraviolet lasersConventional lasersHigh-efficiency lasersLaser ablation techniquePolytetrafluoroethyleneSample temperatureShark skinsPolytetrafluoroethylenes
TNO Identifier
866711
Repository link
https://resolver.tno.nl/uuid:20cd3596-58ea-4dca-9404-d6fb772307fb
DOI
https://dx.doi.org/10.1088/2053-1591/ab0b12/
ISSN
20531591
Source
Materials Research Express, 6(6)
Publisher
Institute of Physics Publishing
Article nr.
65309
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