Phase separation of binary mixtures in shear flow: A numerical study
The phase-separation kinetics of binary fluids in shear flow is studied numerically in the framework of the continuum convection-diffusion equation based on a Ginzburg-Landau free energy. Simulations are carried out for different temperatures both in d=2 and 3. Our results confirm the qualitative picture put forward by the large-N limit equations studied by Corberi et al. [Phys. Rev. Lett. 81, 3852 (1998)]. In particular, the structure factor is characterized by the presence of four peaks whose relative oscillations give rise to a periodic modulation of the behavior of the rheological indicators and of the average domains sizes. This peculiar pattern of the structure factor corresponds to the presence of domains with two characteristic thicknesses, whose relative abundance changes with time.
Corberi
F
Istituto Nazionale per la Fisica della Materia, Unita di Salerno and Dipartimento di Fisica, Universita di Salerno, 84081 Baronissi (Salerno), Italy.
Gonnella
G
Lamura
A