In this,paper, a model was constructed in order to simulate the behaviour o
f slow growing crystals in high viscosity systems in a tower crystallizer.
This type of crystallizer, ideally,. is an application of the plug-flow con
cept. Plug-flow conditions are an advantage when a narrow crystal size dist
ribution is the goal desired. The model was based on the following assumpti
ons: steady state operation,, no nucleation or growth rate dispersion, no b
reakage, size-dependent growth and settling of crystals. A simulation examp
le for sucrose is presented although the model applies to other similar sys
tems. (C) 2001 Elsevier Science B.V. All rights reserved.