Cyril Desjouy

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• PhD
• Professor (Assistant) at Le Mans University

Acoustic cavitation-induced microbubbles in a cylindrical resonator filled with water tend to concentrate into ring patterns due to the cylindrical geometry of the system. The shape of these ring patterns is directly linked to the Bjerknes force distribution in the resonator. Experimental observations showed that cavitation bubbles located in the v...

Owing to the complex behavior of ultrasound-induced bubble clouds (nucleation, linear and nonlinear oscillations, collapse), acoustic cavitation remains a hardly controllable phenomenon, leading to poorly reproducible ultrasound-based therapies. A better control of the various aspects of cavitation phenomena for in vivo applications is a key requir...

The local interactions occurring between incident and reflected shock waves in the vicinity of rigid surfaces are investigated. Both regular and irregular – also called von Neumann – regimes of reflection are studied, via experiment and numerical simulation. Shock waves are produced experimentally with a 20 kilovolts electrical spark source which a...

This work refers to the vibration optimization of a fiber optic interferometer whose detection performance may be compromised due to external mechanical or acoustic excitations. In such an interferometer, the optical path is split into two arms, with one significantly longer than the other. Optimizing the interferometer involves minimizing the phas...

Realistic acoustic problems often involve interactions between arbitrary-shaped moving objects at the interface with a fluid domain. The present work aims at developing numerical methods to take into account moving boundaries for acoustic problems, with a high order of convergence. The reference problem considered in this work is the solution of th...

The activation of a radical polymerization using ultrasound in water is an eco-friendly way to produce synthetic latexes, as it avoids using radical initiators and surfactants that negatively impact the environment. Such an experiment can be achieved by exciting a water bath (so-called generator) in which the reaction vessel is immersed with an ult...

We study the propagation of high-amplitude sound waves, in the form of pulse-like solitary waves, in an air-filled acoustic waveguide of periodically varying cross section. Our numerical simulations, solving the compressible Navier–Stokes equations in two dimensions, as well as our experimental results, strongly suggest that nonlinear losses, origi...

We study the propagation of high-amplitude sound waves, in the form of pulse-like solitary waves, in an air-filled acoustic waveguide of periodically varying cross section. Our numerical simulations, solving the compressible Navier-Stokes equations in two dimensions, as well as our experimental results, strongly suggest that nonlinear losses, origi...

The reflection of weak shockwaves on rigid boundaries at grazing angles was studied in different geometrical configurations. It was shown that even in the case of weak shocks, irregular reflection of N-waves can lead to the formation of a three shocks pattern with a Mach stem, a triple point above the rigid surface and an angle reflection which dif...

The nonlinear oscillations of a single bubble in an acoustic field are studied for both monofrequency and bifrequency excitations. An approximate solution of the Rayleigh-Plesset equation is obtained by using the method of multiple scales and is compared with direct numerical computations. Frequency-response curves show good agreement with the nume...

The study of acoustic shock propagation in complex environments is of great interest for urban acoustics, but also for source localization, an underlying problematic in military applications. To give a better understanding of the phenomenon taking place during the propagation of acoustic shocks, laboratory-scale experiments and numerical simulation...

In the context of the scientific program SIMMIC supported by the French National Agency for Research (SIMI 9, ANR 2010 BLANC 0905 03), new wide band MEMS piezoresistive microphones have been designed and fabricated for weak shock wave measurements. The fabricated microphones have a high frequency resonance between 300 to 800 kHz depending on the me...

In the context of both nonlinear acoustics, and downscaled acoustic or aero-acoustic experiments, the characterization of the high frequency response of microphones and pressure sensors remains a critical challenge. In the case of the design of new MEMS microphones and shock pressure sensors with response in the frequency range of 10 kHz–1 MHz, thi...

Amongst the variety of complex phenomena encountered in nonlinear physics, a hysteretic effect can be expected on ultrasound cavitation due to the intrinsic nonlinearity of bubble dynamics. When applying successive ultrasound shots for increasing and decreasing acoustic intensities, a hysteretic behaviour is experimentally observed on inertial cavi...

En raison du comportement complexe des nuages de bulles générés par ultrasons, la cavitation acoustique demeure un phénomène difficilement maîtrisable. Un meilleur contrôle de la cavitation ultrasonore apparaît donc primordial pour le développement de nouvelles techniques de thérapie ultrasonore basées sur la cavitation. Différente études, ont rapp...

Sonoporation process, at the origin of ultrasound cell transfection, is ruled by the interaction between cells and cavitating bubbles. Due to the stochastic behavior of acoustic cavitation, there exists a need in ensuring a stable state of cavitation within a medium during cell transfection to enhance transfection efficiency and control mortality....

Sonoporation process, at the origin of ultrasound cell transfection, is ruled by the interaction between cells and cavitating bubbles. Due to the stochastic behavior of acoustic cavitation, there exists a need in ensuring a stable state of cavitation within a medium during cell transfection to enhance transfection efficiency and control mortality....

It is well known that acoustic cavitation can facilitate the inward transport of genetic materials across cell membranes (sonoporation). However, partially due to the unstationary behavior of the initiation and leveling of cavitation, the sonoporation effect is usually unstable, especially in low intensity conditions. A system which is able to regu...

This paper focuses on the experimental and numerical studies of acoustic cavitation induced micro bubbles in a standing waveguide filled with water. It is shown that the cylindrical geometry of the system used in this study allows the micro bubbles to self organize into particular patterns. At high pressure amplitudes, the cavitation bubbles tend t...

Ce travail de recherche s'inscrit dans la continuité des travaux déjà effectués dans l'équipe thermoacoustique du Laboratoire d'Acoustique de l'Université du Maine (LAUM, UMR CNRS 6613) depuis 1995, et vise à apporter une meilleure compréhension des phénomènes physiques qui sont mis en jeu dans les machines thermoacoustiques. Le mémoire de thèse es...

In this paper, a new method is proposed to control the thermoacoustic amplification in thermoacoustic engines. This method, based on the active control of the spatial distribution of the acoustic field by means of auxiliary acoustic sources, is applied here to an annular thermoacoustic engine. Two auxiliary acoustic sources are used to tune the spa...

This research work ensues from previous works carried out at the Laboratoire d'Acoustique de l'Université du Maine (LAUM, UMR CNRS 6613) since 1995, and aims at providing to a deeper understanding of the physical process which are involved in thermoacoustic devices. This thesis report is divided into two parts, both dealing with systems based on ac...

This paper deals with the measurement of acoustic particle velocity and acoustic streaming velocity in a closed-loop waveguide in which a resonant traveling acoustic wave is sustained by two loudspeakers appropriately controlled in phase and amplitude. An analytical model of the acoustic field and a theoretical estimate of the acoustic streaming ar...

The first part of this work deals with the study of an annular acoustic resonator, where the acoustic field is controlled by two loud-speakers in order to generate a purely traveling wave. The results of a complete electroacoustic modeling of this device, where the acoustic field is accurately defined, are compared to the experimental results. The...

Cette étude porte sur la mise en \oe uvre et la modélisation d'un dispositif expérimental de résonateur acoustique annulaire où la structure du champ est contrôlée au moyen de deux haut-parleurs placés le long du guide afin d'y générer une onde plane purement progressive. Un modèle électroacoustique complet de ce dispositif, permettant de détermine...