Print Email Facebook Twitter High-efficiency laser fabrication of drag reducing riblet surfaces on pre-heated Teflon Title High-efficiency laser fabrication of drag reducing riblet surfaces on pre-heated Teflon Author Žemaitis, A. Mikšys, J. Gaidys, M. Gecys, P. Gedvilas, M. Publication year 2019 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. Subject Direct laser ablationDrag reductionPre-heatedPTFERibletsShark-skin-likeTeflonAblationDrag reductionFrictionLaser ablationUltraviolet lasersConventional lasersHigh-efficiency lasersLaser ablation techniquePolytetrafluoroethyleneSample temperatureShark skinsPolytetrafluoroethylenes To reference this document use: http://resolver.tudelft.nl/uuid:20cd3596-58ea-4dca-9404-d6fb772307fb DOI https://doi.org/10.1088/2053-1591/ab0b12/ TNO identifier 866711 Publisher Institute of Physics Publishing ISSN 2053-1591 Source Materials Research Express, 6 (6) Article number 65309 Document type article Files To receive the publication files, please send an e-mail request to TNO Library.