Ultrasonic Wave Propagation in Dispersed Media
Summary
Ultrasonic wave propagation in dispersed media encompasses the study of how high-frequency acoustic waves interact with heterogeneous systems such as particle suspensions, emulsions and porous matrices. As ultrasonic waves traverse these media, they undergo scattering, absorption and mode conversion processes that modify their phase velocity, amplitude and spectral characteristics. The interplay between particle size relative to the wavelength, volume fraction, material contrast and fluid viscosity gives rise to complex dispersion relations and attenuation spectra. Recent theoretical and experimental advances in multiple scattering theory, effective medium modelling and coherent detection techniques have enabled precise quantification of microstructural parameters, including particle size distribution and concentration. Practical applications span real-time monitoring of industrial slurries, non-invasive process control in petrochemistry, medical ultrasound imaging and the deliberate design of acoustic metamaterials with bespoke refractive properties.
Research from Nature Portfolio
Recent studies have elucidated the profound influence of viscous shear-wave interactions on the effective acoustic response of suspensions of sub-wavelength inclusions. By integrating shear-mediated multiple scattering into an effective field framework, researchers have derived complex effective density, bulk modulus and wavenumber expressions that capture both compressional and shear losses. These findings reveal that viscous coupling between closely spaced particles can induce negative acoustic refraction in soft metamaterials composed of porous elastic inclusions. Moreover, the work demonstrates that the frequency band and magnitude of negative phase velocity can be tuned via particle size, concentration and the viscosity of the suspending medium, offering practical routes to engineer ultrasonic wave control in complex fluids.
Ultrasonic Wave Propagation in Dispersed Media publication trend
The graph below shows the total number of articles in ultrasonic wave propagation in dispersed media across all publications each year (not limited to Nature Index journals).
Technical terms
Attenuation: Reduction in ultrasonic wave amplitude due to scattering and absorption as the wave travels through a medium.
Multiple scattering: Successive redirection of wave energy caused by repeated interactions with discrete inclusions in a heterogeneous medium.
Shear-wave reconversion: Transformation of compressional waves into shear waves (and back) at particle–fluid interfaces, contributing to additional attenuation.
Effective wavenumber: A complex quantity describing the averaged propagation constant in a dispersed medium, encompassing both phase velocity and attenuation.
Ensemble average: Statistical averaging over many realisations of a random medium to obtain macroscopic wave properties independent of specific microstructural arrangements.
References
- Experimental verification of nanofluid shear-wave reconversion in ultrasonic fields. Nanoscale (2016).
- Characterisation of colloidal dispersions using ultrasound spectroscopy and multiple-scattering theory inclusive of shear-wave effects. Chemical Engineering Research and Design (2016).
- Multiple scattering in random dispersions of spherical scatterers: Effects of shear-acoustic interactions. The Journal of the Acoustical Society of America (2017).
- Multiple Waves Propagate in Random Particulate Materials. SIAM Journal on Applied Mathematics (2019).
- Effective waves for random three-dimensional particulate materials. New Journal of Physics (2021).
- Shear-mediated contributions to the effective properties of soft acoustic metamaterials including negative index. Scientific Reports (2015).
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