  Chondrules are often surrounded by fine-grained rims or igneous rims. The
properties of these rims reflect their formation histories. While the formation
of fine-grained rims is modeled by the accretion of dust grains onto
chondrules, the accretion should be followed by the growth of dust grains due
to the shorter growth timescale than the accretion. In this paper, we
investigate the formation of rims, taking into account the growth of porous
dust aggregates. We estimate the rim thickness as a function of the chondrule
fraction at a time when dust aggregate accretion onto chondrules is switched to
collisions between these chondrules. Our estimations are consistent with the
measured thicknesses of fine-grained rims in ordinary chondrites. However,
those of igneous rims are thicker than our estimations. The thickness of
igneous rims would be enlarged in remelting events.
