S. Puri, A. J. Bray and J. L.Lebowitz
Phase Separation Kinetics in a Model with Order-Parameter Dependent
Mobility
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ABSTRACT.  We present extensive results from 2-dimensional simulations of phase
separation kinetics in a model with order-parameter dependent
mobility. We find that the time-dependent structure factor exhibits
dynamical scaling and the scaling function is numerically
indistinguishable from that for the Cahn-Hilliard (CH) equation, even
in the limit where surface diffusion is the mechanism for domain
growth. This supports the view that the scaling form of the structure
factor is "universal" and leads us to question the conventional wisdom
that an accurate representation of the scaled structure factor for the
CH equation can only be obtained from a theory which correctly models
bulk diffusion.