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Effect of geometric variations on the performance of gas dispersion impellers with semicircular blades
Author(s) -
Fasano Julian B.,
Myers Kevin J.,
Janz Eric E.
Publication year - 2011
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.20459
Subject(s) - impeller , dispersion (optics) , blade (archaeology) , physics , optics , mechanics , mechanical engineering , engineering
The effects of impeller blade width and blade number on the gas dispersion behaviour of disc impellers with semicircular blades have been characterised. Increasing blade width or number increases the ungassed turbulent power number and reduces the drop in power draw upon gassing. While speed and power required for gas dispersion decrease with increasing blade width and number, the dispersion torque is relatively independent of these impeller geometric characteristics. A three‐blade impeller exhibits the worst gas dispersion characteristics, while a four‐blade impeller with non‐uniform blade spacing outperforms a four‐blade impeller with uniform blade spacing.