An Efficiency of the Liquid Homogenization in Agitated Vessels Equipped with Off-Centred Impeller

Szoplik, J. and Karcz, J. An Efficiency of the Liquid Homogenization in Agitated Vessels Equipped with Off-Centred Impeller Chemical Papers, Vol.59, No. 6a, 2005, 373-379

Document type: Článok z časopisu / Journal Article
Collection: Chemical papers  
 
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Author(s) Szoplik, J.
Karcz, J.
Title An Efficiency of the Liquid Homogenization in Agitated Vessels Equipped with Off-Centred Impeller
Journal name Chemical Papers
Publication date 2005
Year available 2005
Volume number 59
Issue number 6a
ISSN 0366-6352
Start page 373
End page 379
Place of publication Poland
Publisher Versita
Collection year 2005
Language english
Subject 290000 Engineering and Technology
290600 Chemical Engineering
Abstract/Summary 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.
 
 
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