الفهرس 
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Abstract
In. this study attention is focused on the effect of se~ondary nucleation on the behaviour of two types of
stirring i.e mechanical and air on the crystallization pl~cess for both batch and contnious operation.
For the experimental work ,sodium chloride was sleeeted for the isothermal continuous operation, where 2ixed
used, while potassium sUlphate was chosen for the batchhcooled crystallizer. A total of thirt] runs were performed for both types of crystallizers working under different
b- In case of 8.ir stirring secondary Ilucle2. tion can be neglected, vhile it is extreme2.y sigx:~.i= ficant for illechanically-stirre~ cryal1i7Br3~
c- Grapbical represelltion of tbe popu la tiOIl deL.”” sit] in case of mechanical stirring , indicetGz
tbat the growth rate is size-cependeuc ; and
On the contrary, the growth rate is sizeendent in case of air stirring. This representat-
d- Two correlati.ons are proposed for the ccntinous operation:
centration. The system can be exhibited as a single steady state po~~t. The exaillination of
be userul in the design ,start up, and c’Jn.trol crystal size distributiono
a- The nonlinear integere.· -differential equattions describing the system are solved using