| 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 |
|