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SUMMARY:Multimode Multiple Scattering in Soft Media - Valerie Pinfield (Lo
 ughborough University)
DTSTART:20230323T140000Z
DTEND:20230323T143000Z
UID:TALK195721@talks.cam.ac.uk
DESCRIPTION:My talk will consider the propagation of ultrasound in nano/mi
 croparticle suspensions consisting of randomly distributed solid particles
  in a viscous liquid which is a system relevant to industrial process moni
 toring and to the characterisation of soft materials e.g. biological media
 . The embedding medium supports multiple wave modes: elastic waves (longit
 udinal)\, thermal waves (longitudinal) and shear waves (transverse)\; at M
 Hz frequencies in typical liquids the wavelengths of both thermal and shea
 r modes are much smaller than the elastic (compressional) wavelength and a
 re both dissipative. I consider systems in which the compressional wavelen
 gth is large compared with the particle size\, but with arbitrary shear wa
 velength. The multiple scattering effects include mode conversions for whi
 ch the leading terms appear at second order in concentration. I explore th
 e dominant contributions from multi-mode multiple scattering in such syste
 ms\, based on ensemble averaged multiple scattering formulations based on 
 multipole expansions and the T-matrix for individual scatterers.
LOCATION:Seminar Room 1\, Newton Institute
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