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Via hydrodynamics preserving molecular dynamics simulations we study growthphenomena in a phase separating symmetric binary mixture model. We quenchhigh-temperature homogeneous configurations to state points inside themiscibility gap, for various mixture compositions. For compositions around thesymmetric or critical value we capture the rapid linear viscous hydrodynamicgrowth due to advective transport of material through tube-like interconnecteddomains. The focus of the work, however, is on compositions close to any of thebranches of the coexistence curve. In this case, the growth in the system,following nucleation of droplets of the minority species, occurs viacoalescence mechanism. Using state-of-the-art techniques we have identifiedthat these droplets, between collisions, exhibit diffusive motion. The value ofthe exponent for the power-law growth, related to this diffusive coalescencemechanism, as the composition keeps departing from the critical value, has beenestimated. This nicely agrees with a theoretical number. These results arecompared with the growth that occurs via particle diffusion mechanism, innon-hydrodynamic environment.

Hydrodynamic Effects in Kinetics of Phase Separation in Binary Fluids: Critical versus off-critical compositions