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Effect of Impeller Blade Height on the Drop Size Distribution in Agitated Dispersions
Author(s) -
Naseef H.,
Soultan A.,
Stamatoudis M.
Publication year - 2006
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.200500128
Subject(s) - impeller , sauter mean diameter , drop (telecommunication) , materials science , dispersion (optics) , mechanics , agitator , blade (archaeology) , chemistry , composite material , analytical chemistry (journal) , chromatography , optics , thermodynamics , mechanical engineering , physics , engineering , nozzle
A common method to achieve a contact of two liquid phases – required for many chemical engineering operations – is the dispersion of one into the other by mechanical agitation. The drop size distribution in such an agitated dispersion is a result of the dynamic equilibrium existing between the breaking and coalescing drops. A comparison has been made of drop diameters produced by four disk type impellers differing only in blade height ( D W = 1, 2, 4 and 6 cm). Measurements in situ at 200, 250, 300, 350, 400, 450 rpm and at holdup fractions 0.02, 0.05, and 0.07, showed that the Sauter mean drop diameters increased up to 140 % as the impeller blade height decreased from 6 to 1 cm. Plots of ln α 32 vs. ln N , lnα 32 vs. ln D T and ln α 32 vs. ln α max gave straight lines.