Using image analysis in the study of multiphase gas absorption |
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Authors: | P.C. Mena J.A. Teixeira |
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Affiliation: | a Departamento de Engenharia Química, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias s/n, 4200-465 Porto, Portugal b Laboratoire des Sciences du Génie Chimique, CNRS-ENSIC-INPL, 1, Rue Grandville, BP 451, F-54001 Nancy Cedex, France c Centro de Engenharia Biolgica - IBQF, Universidade do Minho, Campus de Gualtar, 4710-057 Braga, Portugal |
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Abstract: | For the air-water-calcium alginate beads system, the effect of the presence of solids on the mass transfer characteristics in a bubble column was experimentally studied.Volumetric liquid side mass transfer coefficient, kLa, specific interfacial area, a, and hence liquid side mass transfer coefficient, kL, were determined under different solid concentrations (0, 5, and 10 vol%), superficial gas velocities (up to 0.27 cm/s) and solid sizes (1.2 and 2.1 mm diameter). The bubble characteristics, namely the interfacial area, were obtained using an image analysis technique.This technique proved to be a suitable and practical method to characterize mass transfer phenomena in bubble columns for the range of operating conditions used. The solids affect negatively kLa, decreasing both a and kL, the effect being more pronounced for the smaller particles. For these particles the variation of kLa is due to the variation of its two components, while for larger particles kLa variation is due, essentially, to changes in kL as no significant differences in a were observed. |
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Keywords: | Absorption Bubble column Mass transfer Multiphase reactors Image analysis Particles |
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