FEM simulation of a sono-reactor accounting for vibrations of the boundaries

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Title: FEM simulation of a sono-reactor accounting for vibrations of the boundaries
Authors: Louisnard, Olivier | González García, José | Tudela Montes, Ignacio | Klima, Jiri | Sáez Bernal, Verónica | Vargas Hernández, Yolanda
Research Group/s: Nuevos Desarrollos Tecnológicos en Electroquímica: Sonoelectroquímica y Bioelectroquímica
Center, Department or Service: Universidad de Alicante. Departamento de Química Física | Centre RAPSODEE | Academy of Sciences of the Czech Republic. J. Herovsky Institute of Physical Chemistry | Universidad de Santiago de Chile. Laboratorio de Ultrasonidos
Keywords: Finite elements | Ultrasound | Standing waves | Fluid-structure interaction | Acoustic cavitation
Knowledge Area: Química Física
Date Created: 2008
Issue Date: 2009
Publisher: Elsevier
Citation: LOUISNARD, Olivier, et al. “FEM simulation of a sono-reactor accounting for vibrations of the boundaries”. Ultrasonics Sonochemistry. Vol. 16, Issue 2 (Febr. 2009). ISSN 1350-4177, pp. 250-259
Abstract: 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.
Sponsor: 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).
URI: http://hdl.handle.net/10045/8492
ISSN: 1350-4177
DOI: 10.1016/j.ultsonch.2008.07.008
Language: eng
Type: info:eu-repo/semantics/preprint
Peer Review: no
Publisher version: http://dx.doi.org/10.1016/j.ultsonch.2008.07.008
Appears in Collections:INV - NDTESB - Artículos de Revistas

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