New image analysis methods for the study of mixing patterns in stirred tanks
2000 (English)In: Canadian Journal of Chemical Engineering, ISSN 0008-4034, E-ISSN 1939-019X, Vol. 78, no 2, 273-285 p.Article in journal (Refereed) Published
A method of treating data acquired with the planar laser-induced fluorescence technique has been developed to visualize the topology of two-dimensional concentration fields and to describe the dynamics of the coherent mixing structures identified; This method is based on a conditional binary transformation of the local concentration data, combined with a joint probability calculation. The methodology has been used to investigate the mixing in a stirred tank, at two injection port locations (in the bulk and in the impeller stream region). With bulk injection, a folding phenomenon of the coherent mixing structure was detected. Away from this port, large-scale spatially periodic motion was identified, with a characteristic time of oscillation of the order of 2 to 3 s. With injection in the impeller stream region, no spatial instabilities of the coherent structure were detected. Local oscillations of the coherent mixing structure were found both on short and long time-scales (i.e., similar to 1 and similar to 80 s).
Place, publisher, year, edition, pages
2000. Vol. 78, no 2, 273-285 p.
planar laser-induced fluorescence, dynamic structural analysis, conditional analysis, mixing, stirred tank, Rushton turbine, laser-induced fluorescence, scale, jet
IdentifiersURN: urn:nbn:se:kth:diva-19812ISI: 000087488700001OAI: oai:DiVA.org:kth-19812DiVA: diva2:338504
QC 201005252010-08-102010-08-10Bibliographically approved