Calcium alginate beads motion in a foaming three-phase bubble column
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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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_13858947_v324_n_p358_Salierno |
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todo:paper_13858947_v324_n_p358_Salierno2023-10-03T16:12:15Z Calcium alginate beads motion in a foaming three-phase bubble column Salierno, G. Maestri, M. Piovano, S. Cassanello, M. Cardona, M.A. Hojman, D. Somacal, H. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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 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 |
| 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. |
| format |
JOUR |
| author |
Salierno, G. Maestri, M. Piovano, S. Cassanello, M. Cardona, M.A. Hojman, D. Somacal, H. |
| author_facet |
Salierno, G. Maestri, M. Piovano, S. Cassanello, M. Cardona, M.A. Hojman, D. Somacal, H. |
| author_sort |
Salierno, G. |
| 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 |
| url |
http://hdl.handle.net/20.500.12110/paper_13858947_v324_n_p358_Salierno |
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