Ultrasonic wave transport in strongly scattering resonant suspensions

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• Thomas Brunet (University of Bordeaux)
• Monday 22 May 2023, 16:15-17:00
• Seminar Room 1, Newton Institute.

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MWSW04 - Multiple scattering in engineering and applied sciences

The key transport parameters of acoustic waves travelling in disordered media are studied through ultrasonic experiments on monodisperse resonant suspensions. Through accurate measurements of both ballistic and diffusive transport over a wide range of frequencies, we show that the group velocity of the ballistic component may differ significantly from the energy velocity of the diffusive waves, in particular in the vicinity of scattering resonances [1]. For dilute systems made of liquid scatterers, we present evidence for the crucial role played by the refractive acoustic index of the droplets relative to the surrounding media by studying resonant emulsions made of “slow” fluorinated oil droplets or “fast” liquid metallic droplets [2]. Our observations are successfully explained by theories based on Independent Scattering Approximations relevant for these diluted media. However, we show that ISA fails as soon as the volume fraction is higher than 10%. For these concentrated disordered resonant suspensions, the transport of the multiply scattered waves becomes sub-diffusive in the vicinity of resonances as predicted by Self-Consistent Theory [3] and can be localized in some specific cases that we will discuss at the end of the talk.   [1] B. Tallon, T. Brunet, and J.H. Page, Physical Review Letters 119, 164301, 2017 [2] B. Tallon, T. Brunet, J. Leng, and J.H. Page, Physical Review B 101 , 054202, 2020 [3] B. Tallon, T. Brunet, and J.H. Page, under revision for Physical Review B  

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