Features of the motion of gel particles in a three-phase bubble column under foaming and non-foaming conditions |
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Authors: | Gabriel Salierno Mauricio Maestri Stella Piovano Miryan Cassanello María Angélica Cardona Daniel Hojman Héctor Somacal |
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Affiliation: | 1.Laboratorio de Reactores y Sistemas para la Industria-LARSI, Dep. Industrias, FCEyN, Universidad de Buenos Aires, Int. Güiraldes 2620, C1428 BGA Buenos Aires, Argentina;2.Laboratorio de Diagnóstico por Radiaciones-LADiR, Dep. de Física Experimental, Comisión Nacional de Energía Atómica(CNEA), San Martín, Buenos Aires, Argentina;3.Universidad de San Martín, San Martín, Buenos Aires, Argentina |
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Abstract: | Features of the motion of gel particles in a three-phase bubble column with non-foaming and foaming gas–liquid systems, determined by using experiments of radioactive particle tracking (RPT), have been compared. The tracer used is a gel particle which resembles typical immobilized biocatalyst. The tracer trajectory is analyzed to extract relevant information for design purposes. The solid velocity field, turbulence parameters, dispersion coefficients, mixing times and flow transitions are determined and compared. The presence of foam significantly affects many quantified parameters, especially within the heterogeneous flow regime. The hydrodynamic stresses are reduced in the presence of foam, especially close to the disengagement. The dispersion coefficients also decrease, and the solid mixing time is only slightly affected by the presence of foam. Gas holdup, inferred both from RPT experiments and from gamma ray scanning, is higher for foaming systems and leads to a shift in the transition gas velocity towards higher values. |
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Keywords: | Bubble columns Solid motion Gel beads Foaming Particle tracking Mixing |
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