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Dynamics of Lagrangian sensor particles : the effect of non-homogeneous mass distribution
Citation Link: https://doi.org/10.15480/882.13253
Publikationstyp
Journal Article
Date Issued
2024-08-01
Sprache
English
TORE-DOI
Journal
Volume
12
Issue
8
Article Number
1617
Citation
Processes 12 (8): 1617 (2024)
Publisher DOI
Scopus ID
Publisher
Multidisciplinary Digital Publishing Institute
The growing demand for bio-pharmaceuticals necessitates improved methods for the
characterization of stirred tank reactors (STRs) and their mixing heterogeneities. Traditional Eulerian
measurement approaches fall short, culminating in the use of Lagrangian Sensor Particles (LSPs) to
map large-scale STRs and track the lifelines of microorganisms such as Chinese Hamster Ovary cells.
This study investigates the hydrodynamic characteristics of LSPs, specifically examining the effects
that the size and position of the Center of Mass (CoM) have on their flow-following capabilities.
Two Lagrangian Particle (LP) designs are evaluated, one with the CoM and a Geometric Center
aligned, and another with a shifted CoM. The experimental study is conducted in a rectangular vessel
filled with deionized water featuring a stationary circular flow. Off-center LPs exhibit higher velocities,
an increased number of floor contacts, and moreover, a less homogeneous particle probability
of presence within the vessel compared to LPs with CoM and Geometric Center aligned. Lattice
Boltzmann Large Eddy Simulations provide complementary undisturbed fluid velocity data for the
calculation of the Stokes number St. Building upon these findings, differences in the Stokes number
St between the two LP variants of ΔSt = 0.01 (25 mm LP) and ΔSt = 0.13 (40 mm LP) are calculated,
highlighting the difference in flow behavior. Furthermore, this study offers a more representative
calculation of particle response time approach, as the traditional Stokes number definition does not
account for non-homogeneous particles, resulting in an alternative Stokes number (ΔStalt = 0.84
(25 mm LP) and ΔStalt = 2.72 (40 mm LP)). This study contributes to the improved characterization of
STRs through the use of Lagrangian Sensor Particles. Results highlight the implications the internal
mass distribution has on LSP design, offering crucial considerations for researchers in the field.
characterization of stirred tank reactors (STRs) and their mixing heterogeneities. Traditional Eulerian
measurement approaches fall short, culminating in the use of Lagrangian Sensor Particles (LSPs) to
map large-scale STRs and track the lifelines of microorganisms such as Chinese Hamster Ovary cells.
This study investigates the hydrodynamic characteristics of LSPs, specifically examining the effects
that the size and position of the Center of Mass (CoM) have on their flow-following capabilities.
Two Lagrangian Particle (LP) designs are evaluated, one with the CoM and a Geometric Center
aligned, and another with a shifted CoM. The experimental study is conducted in a rectangular vessel
filled with deionized water featuring a stationary circular flow. Off-center LPs exhibit higher velocities,
an increased number of floor contacts, and moreover, a less homogeneous particle probability
of presence within the vessel compared to LPs with CoM and Geometric Center aligned. Lattice
Boltzmann Large Eddy Simulations provide complementary undisturbed fluid velocity data for the
calculation of the Stokes number St. Building upon these findings, differences in the Stokes number
St between the two LP variants of ΔSt = 0.01 (25 mm LP) and ΔSt = 0.13 (40 mm LP) are calculated,
highlighting the difference in flow behavior. Furthermore, this study offers a more representative
calculation of particle response time approach, as the traditional Stokes number definition does not
account for non-homogeneous particles, resulting in an alternative Stokes number (ΔStalt = 0.84
(25 mm LP) and ΔStalt = 2.72 (40 mm LP)). This study contributes to the improved characterization of
STRs through the use of Lagrangian Sensor Particles. Results highlight the implications the internal
mass distribution has on LSP design, offering crucial considerations for researchers in the field.
DDC Class
540: Chemistry
620: Engineering
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