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Scalar mixing measurements in a continuously operated stirred tank
Author(s) -
Distelhoff Markus F. W.,
Marquis Andrew J.
Publication year - 2001
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.5450790202
Subject(s) - impeller , rushton turbine , micromixing , mechanics , axial compressor , mixing (physics) , volumetric flow rate , materials science , flow (mathematics) , turbine , jet (fluid) , physics , mechanical engineering , engineering , thermodynamics , gas compressor , microfluidics , quantum mechanics
An LIF (Laser induced flourescence) line scan system was used to obtain unobtrusive scalar concentration measurements in a continuously operated stirred tank agitated by a radial flow Rushton turbine and an axial flow 60°‐pitched blade impeller. A better blending process was generally achieved in the axial flow field, with macro‐ and micromixing in the radial flow field being most complete with fluid injected into the radial discharge jet, and in the axial flow field with fluid injected from above into the rotating impeller. Local concentration levels and fluctuations scaled with the feed pipe flow rate, and the degree of concentration uniformity throughout the tank scaled with the impeller speed and increased with the cube of the power input.