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La diffusion ultrasonore en regime de Rayleigh est utilisee pour etudier la dynamique des agregats fractals et reversibles de globules rouges en suspension concentree. En considerant une floculation homogene d'objets fractals et sur la base du modele hybride de diffusion ultrasonore pour des diffuseurs correles, en regime de Rayleigh, le concept de variance de la concentration locale en particules...
La rupture des agregats de particules en suspension concentree est etudiee par retrodiffusion ultrasonore dans un champ de cisaillement. Les agregats de structure fractale sont consideres comme des centres diffuseurs, non-Browniens, de taille beaucoup plus petite que la longueur d'onde des ultrasons utilises, et de proprietes mecaniques proches de celles du milieu de suspension. Ainsi, l'attenuation...
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