Calcium alginate beads motion in a foaming three-phase bubble column

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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 calci...

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Autores principales:	Maestri, Mauricio Leonardo, Cassanello Fernández, Miryam Celeste, Cardona, María Angélica, Hojman, Daniel, Somacal, Héctor R.
Publicado:	2017
Materias:	Bubble columns Calcium alginate beads Foaming system Hydrodynamic stress Radioactive Particle Tracking Solid motion Alginate Atmospheric movements Calcium Fluid dynamics Fluidized beds Hydrodynamics Kinetic energy Kinetics Radioactive tracers Radioactivity Residence time distribution Risk perception Shear flow Shear stress Turbulence Velocity Foaming systems Radioactive particle tracking Solid motions Gas foaming
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_13858947_v324_n_p358_Salierno http://hdl.handle.net/20.500.12110/paper_13858947_v324_n_p358_Salierno
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_13858947_v324_n_p358_Salierno
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spelling	paper:paper_13858947_v324_n_p358_Salierno2023-06-08T16:12:46Z Calcium alginate beads motion in a foaming three-phase bubble column Maestri, Mauricio Leonardo Cassanello Fernández, Miryam Celeste Cardona, María Angélica Hojman, Daniel Somacal, Héctor R. 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 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. Fil:Maestri, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Cassanello, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Cardona, M.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Hojman, D. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Somacal, H. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2017 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_13858947_v324_n_p358_Salierno http://hdl.handle.net/20.500.12110/paper_13858947_v324_n_p358_Salierno
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	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
spellingShingle	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 Maestri, Mauricio Leonardo Cassanello Fernández, Miryam Celeste Cardona, María Angélica Hojman, Daniel Somacal, Héctor R. Calcium alginate beads motion in a foaming three-phase bubble column
topic_facet	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
description	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.
author	Maestri, Mauricio Leonardo Cassanello Fernández, Miryam Celeste Cardona, María Angélica Hojman, Daniel Somacal, Héctor R.
author_facet	Maestri, Mauricio Leonardo Cassanello Fernández, Miryam Celeste Cardona, María Angélica Hojman, Daniel Somacal, Héctor R.
author_sort	Maestri, Mauricio Leonardo
title	Calcium alginate beads motion in a foaming three-phase bubble column
title_short	Calcium alginate beads motion in a foaming three-phase bubble column
title_full	Calcium alginate beads motion in a foaming three-phase bubble column
title_fullStr	Calcium alginate beads motion in a foaming three-phase bubble column
title_full_unstemmed	Calcium alginate beads motion in a foaming three-phase bubble column
title_sort	calcium alginate beads motion in a foaming three-phase bubble column
publishDate	2017
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_13858947_v324_n_p358_Salierno http://hdl.handle.net/20.500.12110/paper_13858947_v324_n_p358_Salierno
work_keys_str_mv	AT maestrimauricioleonardo calciumalginatebeadsmotioninafoamingthreephasebubblecolumn AT cassanellofernandezmiryamceleste calciumalginatebeadsmotioninafoamingthreephasebubblecolumn AT cardonamariaangelica calciumalginatebeadsmotioninafoamingthreephasebubblecolumn AT hojmandaniel calciumalginatebeadsmotioninafoamingthreephasebubblecolumn AT somacalhectorr calciumalginatebeadsmotioninafoamingthreephasebubblecolumn
_version_	1768545892968693760

Calcium alginate beads motion in a foaming three-phase bubble column

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