Physica A: Statistical Mechanics and its Applications

Spinodal decomposition in binary fluids under shear flow

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We discuss the effects of shear rates on the structure, rheology and kinetics of phase separation in binary fluids through numerical Langevin simulations in both two- and three-dimensions. Our major findings are as follows: (1) shear flow distorts the isotropy properties in normal spinodal decomposition. Under stronger shear, a string phase appears; (2) domains grow differently in directions parallel and perpendicular to the flow direction; (3) excess shear viscosities due to shear flow have a characteristic peak as a function of shear rates. We compare our findings with the experimental data and simulation results which do not incorporate hydrodynamics.