Rebound and reentrainment processes are briefly reviewed. They are dis
cussed in light of a new simulation of incomplete particle bounces. Zn
the simulation, particle trajectories are follow-ed after bouncing wi
th insufficient energy to escape the surface adhesion well. A hypothes
ized process, rebound-reentrainment, is predicted to be important only
for large particles (>10 mu m radius), or even larger sized particles
if the coefficients of restitution are small compared to glass (i.e.,
much less than 0.95). The Reeks ct al. (1988) theory does not appear
well supported for small (micrometer size) particles.