Planar laser induced fluorescence technique for measurements of concentration fields in continuous stirred tank reactors |
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Authors: | I Houcine H Vivier E Plasari R David J Villermaux |
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Affiliation: | (1) Laboratoire des Sciences du Génie Chimique CNRS - ENSIC - INPL, 1, Rue Grandville B.P. 451, F-54001 Nancy Cedex, France, FR |
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Abstract: | A new non-intrusive method based on laser sheet visualization and image processing has been developed to measure the instantaneous
concentration fields of a non-reacting fluorescent dye in a continuous stirred tank reactor. The method consists of measuring
the fluorescence intensity of a tracer excited by a thin planar laser sheet and in transforming it into an instantaneous concentration
field of tracer by a calibration procedure. This allows the characterization of mixing in a plane defined as the cross section
of the flow by the laser sheet. Flow visualization images have been recorded on video tape and subsequently digitized. The
relationship between the intensity of the fluorescent light and the grey level of the images has been established. The first
result is the instantaneous field of dye concentration. A contacting parameter between the fluids coming from the two inlet
sources, and emphasizing the average state of the mixing, has been defined and its field has been determined. The field of
temporal variance, which characterizes the segregation of the investigated zone, has also been computed.
Received: 15 December 1995/Accepted: 28 April 1996 |
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