Experimental verification of nanofluid shear-wave reconversion in ultrasonic fields.
Identifieur interne : 000061 ( France/Analysis ); précédent : 000060; suivant : 000062Experimental verification of nanofluid shear-wave reconversion in ultrasonic fields.
Auteurs : Derek Michael Forrester [Royaume-Uni] ; Jinrui Huang [Royaume-Uni] ; Valerie J. Pinfield [Royaume-Uni] ; Francine Luppé [France]Source :
- Nanoscale [ 2040-3372 ] ; 2016.
Abstract
Here we present the verification of shear-mediated contributions to multiple scattering of ultrasound in suspensions. Acoustic spectroscopy was carried out with suspensions of silica of differing particle sizes and concentrations in water to find the attenuation at a broad range of frequencies. As the particle sizes approach the nanoscale, commonly used multiple scattering models fail to match experimental results. We develop a new model, taking into account shear mediated contributions, and find excellent agreement with the attenuation spectra obtained using two types of spectrometer. The results determine that shear-wave phenomena must be considered in ultrasound characterisation of nanofluids at even relatively low concentrations of scatterers that are smaller than one micrometre in diameter.
DOI: 10.1039/c5nr07396k
PubMed: 26763173
Affiliations:
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pubmed:26763173Le document en format XML
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<front><div type="abstract" xml:lang="en">Here we present the verification of shear-mediated contributions to multiple scattering of ultrasound in suspensions. Acoustic spectroscopy was carried out with suspensions of silica of differing particle sizes and concentrations in water to find the attenuation at a broad range of frequencies. As the particle sizes approach the nanoscale, commonly used multiple scattering models fail to match experimental results. We develop a new model, taking into account shear mediated contributions, and find excellent agreement with the attenuation spectra obtained using two types of spectrometer. The results determine that shear-wave phenomena must be considered in ultrasound characterisation of nanofluids at even relatively low concentrations of scatterers that are smaller than one micrometre in diameter.</div>
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