| Título: | FEM simulation of a sono-reactor accounting for vibrations of the boundaries |
| Autores: |
Louisnard, Olivier González García, José Tudela Montes, Ignacio Klima, Jiri Sáez Bernal, Verónica Vargas Hernández, Yolanda |
| Fecha: |
2008-11-05 2008-11-05 2008 2009 |
| Publicador: | RUA Docencia |
| Fuente: |
 |
| Tipo: | info:eu-repo/semantics/preprint |
| Tema: |
Finite elements Ultrasound Standing waves Fluid-structure interaction Acoustic cavitation Química Física |
| Descripción: |
The chemical effects of acoustic cavitation are obtained in sono-reactors built-up from a vessel and an ultrasonic
source. In this paper, simulations of an existing sono-reactor are carried out, using a linear acoustics model, accounting
for the vibrations of the solid walls. The available frequency range of the generator (19 kHz-21 kHz) is systematically
scanned. Global quantities are plotted as a function of frequency in order to obtain response curves, exhibiting several
resonance peaks. The attenuation coefficient of the wave is taken as a variable parameter, in absence of the precise
knowledge of the bubble size distribution, and its influence is studied. The concepts of acoustic energy, intensity
and active power are recalled, along with the general balance equation for acoustic energy. The latter is used as a
convergence check of the simulations. Finally, it is shown that the interface between the liquid and the solid walls
cannot be correctly represented by the simple approximations of either infinitely soft, or infinitely hard boundaries.
Moreover, the liquid-solid coupling allows the cooling jacket to receive a noticeable part of the input power, although it
is not in direct contact with the sonotrode. It may therefore undergo cavitation and this feature opens the perspective
to design sono-reactors which avoid direct contact between the working liquid and the sonotrode. Besides, the possibility
to shift the main pressure antinode far from the sonotrode area by exciting a resonance of the system
is examined. Generalidad Valenciana (Projects AINV07/044 and AE/07/079); COST D32; Ministry of Education, Youth and Sports (MSMT) of the Czech Republic (Grant No. 1P05OC074). |
| Idioma: | Inglés |
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