ISSN print edition: 0366-6352
ISSN electronic edition: 1336-9075
Registr. No.: MK SR 9/7
Effects of vessel baffling on the drawdown of floating solids
Joanna Karcz and Beata Mackiewicz
Department of Chemical Engineering, Szczecin University of Technology, al. Piastow 42, PL-71 065 Szczecin, Poland
Received: 5 May 2008 Revised: 10 October 2008 Accepted: 14 October 2008
Abstract: The effects of baffling of an agitated vessel on the production of floating particles suspension are presented in this paper.
Critical agitator speed, needed for particles dispersion in a liquid agitated in a vessel of the inner diameter of 0.295 m,
was determined. The just drawdown agitator speeds were defined analogously to the Zwietering criterion. Specific agitation
energy was calculated from the power consumption experimental data obtained by means of the strain gauge method. The experiments
were carried out for twelve configurations of the baffles differing in number, length and their arrangement in the vessels.
The following high-speed impellers were used: up- and downpumping six blade pitched blade turbines, Rushton turbine, and propeller.
The impeller was located in the vessel in the height equal to two-thirds or one-third of the vessel diameter from the bottom
of the vessel. The results were described in the form of a dimensionless equation.
Keywords: agitation - floating particles - baffling
Full paper is available at www.springerlink.com.
Chemical Papers 63 (2) 164–171 (2009)