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Gas holdup and aerated power consumption in mechanically stirred tanks
Author(s) -
Yung C. N.,
Wong C. W.,
Chang C. L.
Publication year - 1979
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.5450570603
Subject(s) - impeller , sparging , dimensionless quantity , aeration , materials science , agitator , mechanics , paddle , continuous stirred tank reactor , power consumption , power (physics) , environmental science , thermodynamics , chemistry , composite material , engineering , physics , waste management
Gas holdup and mechanical power consumption were measured in aerated aqueous nonelectrolyte and electrolyte systems. The experiments were performed in 0.4 m diameter cylindrical flat‐bottomed and hemispherical‐bottomed tanks. Standard six‐blade turbine (D/T = 0.225, 0.325, 0.45) and four‐blade paddle (D/T = 0.225, 0.325) were used over a wide range of gas sparging rate and power dissipation. A semiempirical correlation for holdup with dimensionless groups, i.e. impeller Weber number, aeration number and ratio of impeller diameter to tank diameter has been developed; however, this correlation did not fit the electrolyte solution data. The power consumption data of both the impeller types and tank bottom types were found to fit satisfactorily the Michel‐Miller correlation with 20% accuracy.