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Measurement of the local intensities of segregation with the tomographical dual wavelength photometry
Author(s) -
Buchmann Mathias,
Mewes Dieter
Publication year - 1998
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.5450760334
Subject(s) - photometry (optics) , wavelength , physics , remote sensing , geography , environmental science , astrophysics , optics , stars
The newly developed tomographical dual wavelength photometry enables the measurement of the local intensity of segregation at a multitude of points inside the stirred vessel. This is done by injecting a mixture of an inert and a reacting dye into the vessel. The inert dye serves as a tracer for the macromixing, whereas the vanishing of the reacting dye shows the micromixing. The concentration fields of the dyes are measured simultaneously by transluminating the vessel from three directions with superimposed laser beams of different wavelength. The light absorption by the dyes is measured with CCD‐cameras and these projections are used for the tomographic reconstruction of the concentration fields. Low Reynolds number measurements with a Rushton turbine show better macro‐ and micromixing for a dye injection closer to the stirrer shaft compared to a position closer to the main vortex.

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