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Experimental observation of nonlinear self-focusing in the cavitation field

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dc.creator Campos-Pozuelo, Cleofé
dc.creator Granger, C.
dc.creator Vanhille, Christian
dc.creator Dubus, Bertrand
dc.date 2008-06-25T09:35:02Z
dc.date 2008-06-25T09:35:02Z
dc.date 2007-12
dc.date.accessioned 2017-01-31T01:48:32Z
dc.date.available 2017-01-31T01:48:32Z
dc.identifier XIX Congreso Internacional de Acústica (ICA2007)
dc.identifier http://hdl.handle.net/10261/5301
dc.identifier.uri http://dspace.mediu.edu.my:8181/xmlui/handle/10261/5301
dc.description Ponencia presentada en el XIX Congreso Internacional de Acústica (ICA2007), Madrid, 2-7 Sep 2007.-- PACS: 43.25.Yw.
dc.description The nonlinear self-focusing of the pressure field with onset of cavitation is experimentally and theoretically analysed in the kHz range. Self-focusing in the cavitation field has already been reported above 500 kHz and it was attributed to the non-uniformity of bubble density. In this case, bubble density remains small, non-linearity is weak and focal distance remains much larger than the acoustic wavelength in the liquid.
dc.description In this work, inertial cavitation field radiated by a 20 kHz sonotrode-type transducer is considered. A cone like bubble structure is established. This structure is very repetitive and selfconstructs in any container when a piston like emitter is used. The acoustic field is directly evaluated by using a BR&K. hydrophone and averaged pressure waveforms are analysed. The number of chosen samples is high enough to have stable measured pressure results (including nonlinear distortion). A self-focusing effect is observed with a focal distance comparable to the acoustic wavelength in the liquid. Models accounting for the high bubble density and strong non-linear effects are proposed. Theoretical predictions are compared to experiments and discussed.
dc.description Peer reviewed
dc.format 7285 bytes
dc.format application/pdf
dc.language eng
dc.publisher Sociedad Española de Acústica
dc.relation ICA2007
dc.relation NLA-01-006-IP
dc.rights openAccess
dc.subject Cavitation field
dc.subject Nonlinear acoustics
dc.subject Pressure field
dc.subject Nonlinear self-focusing
dc.subject Bubbly media
dc.subject Acoustic wavelength
dc.subject kHz range
dc.subject Modelisation
dc.title Experimental observation of nonlinear self-focusing in the cavitation field
dc.type Comunicación de congreso

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