A Model for Acoustic Vaporization of Encapsulated Droplets

Francois Coulouvrat (1) , Matthieu Guédra (1)

1 IJLRDA-MPIA - Modélisation, Propagation et Imagerie Acoustique

This work deals with the theoretical modelling of the acoustic vaporization of a droplet encapsulated with a thin viscoelastic shell. A generalized Rayleigh-Plesset equation describing the radial motion of the particle is derived, which accounts for the evaporation rate at liquid/vapor interface, the surface tension between droplet and outer liquid, and the viscoelasticity of the shell. This equation is coupled to heat equations in the liquid media which rule the temperature field around the bubble and thus the mass flux through the surface. Numerical simulations reveal behaviors of the vapor nucleus which can be substantially different from the case of a vapor bubble in an infinite medium. The results show that the ADV threshold depends on frequency in agreement with experimental observations in literature. The rigidity of the shell also affects the ADV threshold and the dynamics of the vapor expansion.

Domaines: Acoustique [physics.class-ph]; Biomécanique [physics.med-ph]

Francois Coulouvrat, Matthieu Guédra. A Model for Acoustic Vaporization of Encapsulated Droplets. RECENT DEVELOPMENTS IN NONLINEAR ACOUSTICS, 2015, 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA, Unknown Region. ⟨10.1063/1.4934418⟩. ⟨hal-01460000⟩