20.500.12556/RUL-116529 Surface functionalization by nanosecond-laser texturing for controlling hydrodynamic cavitation dynamics The interaction between liquid flow and solid boundary can result in cavitation formation when the local pressure drops below vaporization threshold. The cavitation dynamics does not depend only on basic geometry, but also on surface roughness, chemistry and wettability. From application point of view, controlling cavitation in fluid flows by surface functionalization is of great importance to avoid the unwanted effects of hydrodynamic cavitation (erosion, noise and vibrations). However, it could be also used for intensification of various physical and chemical processes. In this work, the surfaces of 10-mm stainless steel cylinders are laser textured in order to demonstrate how hydrodynamic cavitation behavior can be controlled by surface modification. The surface properties are modified by using a nanosecond (10-28 ns) fiber laser (wavelength of 1060 nm). In such a way, surfaces with different topographies and wettability were produced and tested in a cavitation tunnel at different cavitation numbers (1.0-2.6). Cavitation characteristics behind functionalized cylindrical surfaces were monitored simultaneously by high-speed visualization (20,000 fps) and high frequency pressure transducers. The results clearly show that cavitation characteristics differ significantly between different micro-structured surfaces. On some surfaces incipient cavitation is delayed and cavitation extent decreased in comparison with the reference - a highly polished cylinder. It is also shown that the increased surface wettability (i.e., hydrophilicity) delays the incipient cavitation. hydrodynamic cavitation laser surface engineering fluid dynamics laser texturing surface engineering hydrophobic/hydrophilic surface hidrodinamska kavitacija laserski inženiring površin dinamika fluidov laserske obdelave inženiring površin hidrofobna/hidrofilna površina true false true Angleški jezik Slovenski jezik Članek v reviji 2020-05-27 11:52:43 2020-05-27 11:52:49 2022-08-28 03:49:13 0000-00-00 00:00:00 2020 0 0 10 str. art. 105126 Vol. 67 2020 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 532.5(045) 1350-4177 10.1016/j.ultsonch.2020.105126 17154075 RAZ_Petkovsek_Martin_2020.pdf RAZ_Petkovsek_Martin_2020.pdf 1 766EAFCE48634BFCC91170B62040EBF1 2be3b82ae8e980b8ec8b7d374275b305fc4a3d84587f20f7e6d329725133a857 c14ce2b5-a1bb-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=141448 RAZ_Petkovsek_Martin_2020.pdf RAZ_Petkovsek_Martin_2020.pdf 1 804892F497CA24DD92F169C75995B510 98f9db7e22090de600de3a4e48288d901b64668a2b6715cfff35b23f6c592ba4 c15fed91-a1bb-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=141449 https://www.sciencedirect.com/science/article/pii/S1350417719313173 0 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=130151 Fakulteta za strojništvo 0 0 0