Modeling bubble collapse aggressiveness in traveling bubble cavitation using bubble breakup model

0388315 - ÚT 2013 RIV SG eng C - Konferenční příspěvek (zahraniční konf.)
Zima, Patrik - Sedlář, M.
Modeling bubble collapse aggressiveness in traveling bubble cavitation using bubble breakup model.
Proceedings of the Eighth International Symposium on Cavitation (CAV 2012). Singapore: Research Publishing Services, 2012 - (Ohl, C.; Klaseboer, E.; Ohl, S.; Gong, S.; Khoo, B.), s. 182-186. ISBN 978-981-07-2826-7.
[International Symposium on Cavitation /8./ CAV 2012. Singapur (SG), 13.08.2012-16.08.2012]
Grant CEP: GA ČR GAP101/10/1428
Výzkumný záměr: CEZ:AV0Z20760514
Klíčová slova: bubble collapse * traveling bubble cavitation * numerical modeling
Kód oboru RIV: BK - Mechanika tekutin
http://rpsonline.com.sg/proceedings/9789810728267/html/209.xml51.xml

The paper presents the latest progress in assessing the collapse aggressiveness of cavitation bubbles in near-steady-state flow with traveling bubble cavitation using two-way coupling of the RANS equation and the Rayleigh-Plesset equation. The aggressiveness is determined from the energy dissipated during the collapse. It is assumed that bubbles break up under suitable conditions. The criterion for bubble breakup is based on the linear Rayleigh-Taylor analysis of the spherical bubble surface. The model is tested numerically for a 2D hydrofoil. The bubbles are assumed spherical and their interaction with the solid wall is not considered. Material effects due to cavitation erosion are not studied. The model is implemented in the in-house 3-D solver for turbulent pump flow. The numerical results for the 2D hydrofoil are compared to the erosion patterns obtained on the hydrofoil surface obtained from the cavitation tunnel measurement. Extension to complex 3D geometries, such as pump impellers or nozzles, where the condition of traveling or bubbly cavitation mode is fulfilled, is straightforward.
Trvalý link: http://hdl.handle.net/11104/0217449