Real time magnetic resonance imaging and numerical modelling of gas-solid hydrodynamics in vibrated bubbling fluidized beds
Publikationstyp
Conference Poster
Date Issued
2025
Sprache
English
Author(s)
Citation
11th International Granulation Workshop 2025
Contribution to Conference
Publisher Link
Vibrated gas-solid fluidized beds offer improved performance over non-vibrated fluidized beds by preventing particle agglomeration and channeling, facilitating fluidization in systems with high cohesive forces, and enhancing heat transfer, making them a favorable choice for various applications [1]. Studying the hydrodynamics is challenging due to their opaque nature. Intrusive probes like pressure and capacitance sensors measure hydrodynamics in three dimensional (3D) beds but are limited to specific locations and can alter the flow. Therefore, 3D tomographic techniques, such as Magnetic Resonance Imaging (MRI) [2], are favored to study the hydrodynamics within these systems.
This work investigates the gas-solid hydrodynamics of 3D vibrated fluidized beds using real time MRI with a world-wide unique vertical 3T MRI scanner located at TUHH. In contrast to conventional clinical systems, this MRI offers a vertical bore allowing the study of
columnar samples with outer diameters up to 40 cm and several meters in height. Real-time imaging with high temporal resolution enables the observation of dynamics such as bubble growth and coalescence. The size distribution and rise velocity of gas bubbles in the bed are investigated for Geldart group A, B, C and D particles. Additionally, MRI data is compared with Computational Fluid Dynamics - Discrete Element Method (CFD-DEM) numerical simulations to validate drag force models and coarse-graining approaches. The project is financially supported by the German Research Foundation (DFG) under project number 471615686. [1] Guo, Q. et al., Advances in vibrated gas-fluidized beds, Current Opinion in Chemical Engineering, (2023), 22113398, 100977 [2] Penn, A. et al., Real-time probing of granular dynamics with magnetic resonance, Science Advances, (2017), 117-123
This work investigates the gas-solid hydrodynamics of 3D vibrated fluidized beds using real time MRI with a world-wide unique vertical 3T MRI scanner located at TUHH. In contrast to conventional clinical systems, this MRI offers a vertical bore allowing the study of
columnar samples with outer diameters up to 40 cm and several meters in height. Real-time imaging with high temporal resolution enables the observation of dynamics such as bubble growth and coalescence. The size distribution and rise velocity of gas bubbles in the bed are investigated for Geldart group A, B, C and D particles. Additionally, MRI data is compared with Computational Fluid Dynamics - Discrete Element Method (CFD-DEM) numerical simulations to validate drag force models and coarse-graining approaches. The project is financially supported by the German Research Foundation (DFG) under project number 471615686. [1] Guo, Q. et al., Advances in vibrated gas-fluidized beds, Current Opinion in Chemical Engineering, (2023), 22113398, 100977 [2] Penn, A. et al., Real-time probing of granular dynamics with magnetic resonance, Science Advances, (2017), 117-123
Subjects
Magnetic Resonance Imaging
Vibrated gas-solid fluidized beds
Numerical Modelling
DDC Class
620: Engineering