ISSN print edition: 0366-6352
ISSN electronic edition: 1336-9075
Registr. No.: MK SR 9/7
An Efficiency of the Liquid Homogenization in Agitated Vessels Equipped with Off-Centred Impeller
J. Szoplik and J. Karcz
Department of Chemical Engineering, Faculty of Chemical Engineering
Szczecin University of Technology, PL-71 065 Szczecin
Abstract: Efficiency of the liquid homogenization in agitated vessels (with inner diameter D) equipped with
off-centred impeller is analyzed. Experimental studies of the mixing time were carried out in a
0.270 m3 vessel using unsteady-state thermal method. Eccentrically located propeller and pitched
blade turbines were used for agitation of Newtonian liquid (aqueous solution of molasses) within
the turbulent regime of the fluid flow.
Assuming constant value of the specific mixing energy, ε, similar values of the mixing times, tm,
were observed for propeller and pitched blade turbine with three blades. Mixing time was positively
influenced by the increase of impeller diameter and the number of impeller blades.
Assuming constant value of specific energy, ε, the lowest dimensionless mixing time, Θ, corresponded
to the eccentric pitched three-blade turbine with diameter d = 0.5 D. Taking into account
different criteria proposed in literature, eccentric propeller (e/R = 0.57) can be recommended for
liquid homogenization with the most efficiency in the unbaffled agitated vessel, within the range of
the performed measurements.
Full paper in Portable Document Format: 596aa373.pdf
Chemical Papers 59 (6a) 373–379 (2005)