SPINODAL DECOMPOSITION OF BINARY-MIXTURES IN UNIFORM SHEAR-FLOW

The spinodal decomposition of binary mixtures in uniform shear flow is studied in the context of the time-dependent Ginzburg-Landau equation , approximated at one-loop order. We show that the structure factor ob eys a generalized dynamical scaling with different growth exponents al pha(x) = 5/4 and alpha(y) = 1/4 in the flow and in the shear direction s, respectively. The excess viscosity Delta eta after reaching a maxim um relaxes to zero as gamma(-2)t(-3/2), gamma being the shear rate. De lta eta and other observables exhibit log-time periodic oscillations w hich can be interpreted as due to a growth mechanism where stretching and breakup of domains cyclically occur. [S0031-9007(98)07467-5].