  Two-dimensional dendritic growth due to solute precipitation was simulated
using a phase-field model reported earlier [Z. Xu and P. Meakin, J. Chem. Phys.
129, 014705 (2008)]. It was shown that diffusion-limited precipitation due to
the chemical reaction at the solid-liquid interface posses similarities with
diffusion-limited aggregation (DLA). The diffusion-limited precipitation is
attained by setting the chemical reaction rate much larger compared to the
solute diffusion to eliminate the effect of the interface growth kinetics. The
phase-field simulation results were in reasonable agreement with the analytical
solutions. The fractal solid fingers can be formed in the diffusion-limited
precipitation and have a fractal dimension measured , close to 1.64, the
fractal dimensionality of large square lattice diffusion-limited aggregation
(DLA) clusters.
