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Abstract
The liquid-phase mixing in gassed vessels agitated by up- and downward-pumping 30 degrees and 45 degrees pitched-blade turbines has been investigated using the radioactive tracer technique called Positron Emission Particle Tracking (PEPT). Only the flow patterns of the 45 degrees down-pumping pitched-blade turbine were significantly affected by the injection of gas at specific flow rates of up to 1.5 vvm. A fluid agitation index was used to quantify the effectiveness of each impeller, based on the ratio of the average fluid velocity and the impeller tip velocity. At a given agitation speed, the 45 degrees pitched-blade turbines were the most efficient at transferring momentum to the fluid, as indicated by higher circulation indexes. The efficiency of the 45 degrees down-pumping pitched-blade turbine was significantly reduced upon aeration of the vessel, even at low specific gas flow rates of 0.5 vvm.
Original language | English |
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Pages (from-to) | 6371-6380 |
Number of pages | 10 |
Journal | Industrial & Engineering Chemistry Research |
Volume | 44 |
Issue number | 16 |
DOIs | |
Publication status | Published - 3 Aug 2005 |
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Dive into the research topics of 'Hydrodynamic measurements of up- and down-pumping pitched-blade tubines in gassed, agitated vessels, using positron emission particle tracking'. Together they form a unique fingerprint.Projects
- 1 Finished
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Advanced Technology in Catalytic Chemistry and Engineering for Novel Applications (ATHENA)
Winterbottom, M., Nienow, A., Pacek, A. & Wood, J.
SYNETIX, Engineering & Physical Science Research Council
14/09/02 → 13/09/07
Project: Research