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Solid distribution and mixing time in stirred tanks: The case of floating particles
Author(s) -
Paglianti Alessandro,
Carletti Claudio,
Busciglio Antonio,
Montante Giuseppina
Publication year - 2017
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.22854
Subject(s) - homogenization (climate) , materials science , mixing (physics) , conductivity , mechanics , planar laser induced fluorescence , planar , analytical chemistry (journal) , laser , laser induced fluorescence , chromatography , chemistry , optics , computer science , physics , biology , quantum mechanics , biodiversity , ecology , computer graphics (images)
This work concerns floating particle distribution and liquid mixing dynamics in a solid‐liquid stirred tank. Measurements of local solids concentration distribution at steady‐state conditions and of liquid homogenization in the presence of dispersed particles at transient conditions are collected with up‐pumping and down‐pumping pitched blade turbines. Electrical resistance tomography is the selected experimental technique for the data acquisition in the opaque solid‐liquid mixture. For the time dependent conductivity data processing, the same method commonly applied to the mixing time determination from planar laser induced fluorescence measurements is considered. The method is successfully extended to the characterization of liquid mixing with floating particles. The local data obtained by the ERT technique over the whole vessel volume are fully exploited. The robustness of the method for tackling conductivity variations close to the liquid free surface and due to the particles movement is assessed.