20.500.12556/RUL-140844 Laser-induced shock-wave-expanded nanobubbles in spherical geometry The secondary cavitation generation following laser-induced breakdown in aqueous media in spherical geometry, mimicking the geometry of the frontal part of the human eye, was studied. A numerical simulation of the shock wave propagation was performed, yielding peak-pressure maps, correctly predicting the location of the secondary cavitation onset for different shock wave source positions. The comparison between the simulation results and the experiments, performed with a high-precision, multiple-illumination technique, supports the suggested description of the nature of the secondary cavitation onset. It is shown that large transient negative pressures are created at the location of the acoustic image of the shock wave source, which is different from the optical focus. After the passage of the shock wave, abundant secondary cavitation is generated there. Additionally, the existence of an important contributing factor to the reduction of the secondary cavitation threshold is supported by the experimental results, namely the pre-illumination of the water by the breakdown-generating laser pulse, playing a crucial role in conditioning the medium. There is strong experimental evidence of the existence of another mechanism of pre-conditioning the water for the secondary cavitation onset, namely in the form of repetitive negative pressure pulse passage through the same volume, an indication of a possible two- or multiple-stage process. shock wave cavitation bubbles secondary cavitation pre-illumination cavitation bubble udarni val kavitacijski mehurčki sekundarna kavitacija predosvetlitev true false true Angleški jezik Slovenski jezik Članek v reviji 2022-09-20 08:49:16 2022-09-20 08:49:23 2024-03-01 03:57:13 0000-00-00 00:00:00 2022 0 0 12 str. Vol. 89, art. 106160 Sep. 2022 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 532.528 1350-4177 10.1016/j.ultsonch.2022.106160 122021123 1-s2.0-S1350417722002565-main.pdf 1-s2.0-S1350417722002565-main.pdf 1 B82475FC97338D92B2B11352A27BD3F6 1c01d09b5aa249ead0752b86a9d8a569699ed007674a2bbffce7bde1433aac71 6240bccd-d705-11ee-ac9d-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=181343 https://www.sciencedirect.com/science/article/pii/S1350417722002565 1 48f9b868-38b0-11ed-92af-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=161658 Fakulteta za strojništvo 0 0 0