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.
| Original language | English |
|---|---|
| Article number | 065309 |
| Journal | Materials Research Express |
| Volume | 6 |
| Issue number | 6 |
| Early online date | 15 Mar 2019 |
| DOIs | |
| Publication status | Published - 15 Mar 2019 |
Keywords
- PTFE
- Teflon
- Direct laser ablation
- Drag reduction
- Pre-heated
- Riblets
- Shark-skin-like
- n/a OA procedure
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