20.500.12556/RUL-144279 Microbubble collapse near a fiber broken symmetry conditions and a planar jet formation The collapse of microbubbles near a fiber is an example often encountered in water treatment situations and cavitation fibrillation processes. However, due to the broken symmetry conditions, this process has not been studied in detail experimentally or numerically, making it difficult to precisely measure or simulate the rapid bubble evolution during collapse. In this work, we present a novel experimental method, allowing for precisely repeatable cavitation events observation, combined with numerical simulations offering insight into pressure and velocity fields distribution developments in time. Both experimental and numerical works focused on small distances between the bubble and the fiber, where the physical interaction between subjects is the strongest. Four different bubble offsets were considered within the scope of this work, and very good agreement of numerical simulations with experiments was found in all cases. Two modes of bubble collapse were identified, leading to mushroom-shaped bubbles at positions closest to the fiber and a pear-shaped bubble at the farthest position. It is noteworthy that in all four cases, a planar jet formation toward the fiber was observed. The formed jet initially assumes an elongated shape, whereas its stability depends on the mode of bubble collapse. Numerical analysis of the planar jet as the defining feature of the collapse defined lower bounds for the actual values of peak jet velocities, ranging between 250 and 330 m/s, and the resulting impact pressures, which range from 100to 500 MPa. microbubbles numerical analysis cavitation mikro mehurčki numerične analize kavitacija true false true Angleški jezik Slovenski jezik Članek v reviji 2023-02-09 09:30:46 2023-02-09 09:30:52 2023-02-10 03:32:06 0000-00-00 00:00:00 2023 0 0 15 str. iss. 2, art. 023305 Vol. 35 Feb. 2023 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 532:519.62 1070-6631 10.1063/5.0136353 141080067 Mur...-Microbubble_collapse_near_a_fiber.pdf Mur...-Microbubble_collapse_near_a_fiber.pdf 1 8581220A6992A30FD155DF7E915F332E 467610106f731a0c003e1d871900a45096b2ff51317d6e1f32977f29cf5c29c3 30f4c834-a854-11ed-9c94-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=166498 https://aip.scitation.org/doi/10.1063/5.0136353 1 c3a728a6-a853-11ed-9c94-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=166497 Fakulteta za strojništvo 0 0 0