Artículo

Salierno, G.; Maestri, M.; Piovano, S.; Cassanello, M.; Cardona, M.A.; Hojman, D.; Somacal, H."Calcium alginate beads motion in a foaming three-phase bubble column" (2017) Chemical Engineering Journal. 324:358-369
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Abstract:

Calcium alginate beads are frequently used to immobilize enzymes or microorganisms for fermentations carried out in agitated or pneumatic reactors. In this work, the well-known Radioactive Particle Tracking (RPT) technique is used to non-invasively extract relevant information of the motion of calcium alginate beads within a three phase bubble column under foaming conditions, which frequently appear in bioreactors operation. Special care is taken to produce a radioactive tracer that perfectly matches the features of the other particles in density and size. In addition, the tracer has the same texture and wettability since the adherence of gas to particles in foaming systems is crucial in determining the solid motion. Particles distribution, solid residence time, velocity fields, dispersion coefficients, shear stress and turbulence kinetic energy are determined from the radioactive tracer trajectories. Compared to previous works in non-foaming systems with denser particles, a relatively strong inward flow and less definite descending motion of the solid near the column wall is found. Turbulence intensities and shear stress are high in the disengagement zone, particularly for the churn-turbulent flow regime. However, since the biocatalyst damage would also depend on the actual exposure to harsh regions, the frequency of visit at different location was calculated to estimate maps of exposure risks as the product of turbulence stresses and these frequencies. Considering the particles motion, the region of largest risk for hydrodynamic damage is close to the gas entrance zone. © 2017 Elsevier B.V.

Registro:

Documento: Artículo
Título:Calcium alginate beads motion in a foaming three-phase bubble column
Autor:Salierno, G.; Maestri, M.; Piovano, S.; Cassanello, M.; Cardona, M.A.; Hojman, D.; Somacal, H.
Filiación:Laboratorio de Reactores y Sistemas para la Industria–LARSI, Dep. Industrias, FCEyN, Universidad de Buenos Aires, Int. Güiraldes 2620, Buenos Aires, C1428BGA, Argentina
Laboratorio de Diagnóstico por Radiaciones–LADiR, Dep. de Física Experimental, Comisión Nacional de Energía Atómica (CNEA), San Martín, Buenos Aires, Argentina
Escuela de Ciencia y Tecnología, Universidad Nacional de San Martín, Buenos Aires, Argentina
Palabras clave:Bubble columns; Calcium alginate beads; Foaming system; Hydrodynamic stress; Radioactive Particle Tracking; Solid motion; Alginate; Atmospheric movements; Bubble columns; Calcium; Fluid dynamics; Fluidized beds; Hydrodynamics; Kinetic energy; Kinetics; Radioactive tracers; Radioactivity; Residence time distribution; Risk perception; Shear flow; Shear stress; Turbulence; Velocity; Calcium alginate beads; Foaming systems; Hydrodynamic stress; Radioactive particle tracking; Solid motions; Gas foaming
Año:2017
Volumen:324
Página de inicio:358
Página de fin:369
DOI: http://dx.doi.org/10.1016/j.cej.2017.05.060
Handle:http://hdl.handle.net/20.500.12110/paper_13858947_v324_n_p358_Salierno
Título revista:Chemical Engineering Journal
Título revista abreviado:Chem. Eng. J.
ISSN:13858947
CODEN:CMEJA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_13858947_v324_n_p358_Salierno

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Citas:

---------- APA ----------
Salierno, G., Maestri, M., Piovano, S., Cassanello, M., Cardona, M.A., Hojman, D. & Somacal, H. (2017) . Calcium alginate beads motion in a foaming three-phase bubble column. Chemical Engineering Journal, 324, 358-369.
http://dx.doi.org/10.1016/j.cej.2017.05.060
---------- CHICAGO ----------
Salierno, G., Maestri, M., Piovano, S., Cassanello, M., Cardona, M.A., Hojman, D., et al. "Calcium alginate beads motion in a foaming three-phase bubble column" . Chemical Engineering Journal 324 (2017) : 358-369.
http://dx.doi.org/10.1016/j.cej.2017.05.060
---------- MLA ----------
Salierno, G., Maestri, M., Piovano, S., Cassanello, M., Cardona, M.A., Hojman, D., et al. "Calcium alginate beads motion in a foaming three-phase bubble column" . Chemical Engineering Journal, vol. 324, 2017, pp. 358-369.
http://dx.doi.org/10.1016/j.cej.2017.05.060
---------- VANCOUVER ----------
Salierno, G., Maestri, M., Piovano, S., Cassanello, M., Cardona, M.A., Hojman, D., et al. Calcium alginate beads motion in a foaming three-phase bubble column. Chem. Eng. J. 2017;324:358-369.
http://dx.doi.org/10.1016/j.cej.2017.05.060