  We perform computer simulations of a Cahn-Hilliard model of phase separation
which has dynamical asymmetry between the two coexisting phases. The dynamical
asymmetry is incorporated by considering a mobility function which is order
parameter dependent. Simulations of this model reveal morphological features
similar to those observed in viscoelastic phase separation. In the early
stages, the minority phase domains form a percolating structure which shrinks
with time eventually leading to the formation of disconnected domains. The
domains grow as L(t) ~ t^{1/3} in the very late stages. Although dynamical
scaling is violated in the area shrinking regime, it is restored at late times.
However, the form of the scaling function is found to depend on the extent of
dynamical asymmetry.
