Scattering of ultrasonic shock waves in ...
Document type :
Compte-rendu et recension critique d'ouvrage
DOI :
Title :
Scattering of ultrasonic shock waves in suspensions of silica nanoparticles
Author(s) :
Baudoin, Michael [Auteur]
Institut des Nanosciences de Paris [INSP]
Thomas, Jean-Louis [Auteur]
Institut des Nanosciences de Paris [INSP]
Coulouvrat, François [Auteur]
Institut Jean Le Rond d'Alembert [DALEMBERT]
Chanéac, Corinne [Auteur]
Laboratoire de Chimie de la Matière Condensée de Paris [LCMCP]
Institut des Nanosciences de Paris [INSP]
Thomas, Jean-Louis [Auteur]
Institut des Nanosciences de Paris [INSP]
Coulouvrat, François [Auteur]
Institut Jean Le Rond d'Alembert [DALEMBERT]
Chanéac, Corinne [Auteur]
Laboratoire de Chimie de la Matière Condensée de Paris [LCMCP]
Journal title :
Journal of the Acoustical Society of America
Pages :
1209-1220
Publisher :
Acoustical Society of America
Publication date :
2011
ISSN :
0001-4966
HAL domain(s) :
Physique [physics]/Mécanique [physics]/Acoustique [physics.class-ph]
English abstract : [en]
Experiments are carried out to assess, for the first time, the validity of a generalized Burgers’ equation, introduced first by Davidson [J. Acoust. Soc. Am. 54, 1331–1342 (1973)] to compute the nonlinear propagation of ...
Show more >Experiments are carried out to assess, for the first time, the validity of a generalized Burgers’ equation, introduced first by Davidson [J. Acoust. Soc. Am. 54, 1331–1342 (1973)] to compute the nonlinear propagation of finite amplitude acoustical waves in suspensions of “rigid” particles. Silica nanoparticles of two sizes (33 and 69 nm) have been synthesized in a water–ethanol mixture and precisely characterized via electron microscopy. An acoustical beam of high amplitude is generated at 1 MHz inside a water tank, leading to the formation of acoustical shock waves through nonlinear steepening. The signal is then measured after propagation in a cylinder containing either a reference solution or suspensions of nanoparticles. In this way, a “nonlinear attenuation” is obtained and compared to the numerical solution of a generalized Burgers’ equation adapted to the case of hydrosols. An excellent agreement (corresponding to an error on the particles size estimation of 3 nm) is achieved in the frequency range from 1 to 40 MHz. Both visco-inertial and thermal scattering are significant in the present case, whereas thermal effects can generally be neglected for most hydrosols. This is due to the value of the specific heat ratio of water–ethanol mixture which significantly differs from unity.Show less >
Show more >Experiments are carried out to assess, for the first time, the validity of a generalized Burgers’ equation, introduced first by Davidson [J. Acoust. Soc. Am. 54, 1331–1342 (1973)] to compute the nonlinear propagation of finite amplitude acoustical waves in suspensions of “rigid” particles. Silica nanoparticles of two sizes (33 and 69 nm) have been synthesized in a water–ethanol mixture and precisely characterized via electron microscopy. An acoustical beam of high amplitude is generated at 1 MHz inside a water tank, leading to the formation of acoustical shock waves through nonlinear steepening. The signal is then measured after propagation in a cylinder containing either a reference solution or suspensions of nanoparticles. In this way, a “nonlinear attenuation” is obtained and compared to the numerical solution of a generalized Burgers’ equation adapted to the case of hydrosols. An excellent agreement (corresponding to an error on the particles size estimation of 3 nm) is achieved in the frequency range from 1 to 40 MHz. Both visco-inertial and thermal scattering are significant in the present case, whereas thermal effects can generally be neglected for most hydrosols. This is due to the value of the specific heat ratio of water–ethanol mixture which significantly differs from unity.Show less >
Language :
Anglais
Popular science :
Non
Source :