Flow Field Characterization of Bubble-Object Interaction Through Particle Image Velocimetry (PIV)
Sprache des Vortragstitels:
Englisch
Original Tagungtitel:
20th Multiphase Flow Conference - MPF2024
Sprache des Tagungstitel:
Englisch
Original Kurzfassung:
Slurry bubble columns, used in green and sustainable industries, consist of a dynamic three-phase system (fluid, gas, and particles). Understanding their interactions is crucial for sustainable design. This study employs Particle Image Velocimetry (PIV) to examine bubble-object interactions and visualize fluid fluctuations across different regimes. The insights gained into the hydrodynamic effects aim to improve the understanding of multiphase flow processes in slurry bubble columns for industrial applications.
This study employs a specialized Particle Image Velocimetry (PIV) method to track fluid dynamics in bubble and fluid domains, investigating bubble-cylinder interactions as a simplified model for complex particle-bubble dynamics in slurry columns. Since mass transfer and dynamics depend on direct interactions and the flow field around bubbles and particles, a detailed study of these flow dynamics is required.
The experiment uses a centi-scale Plexiglas square column filled with pure water, with bubbles generated by a syringe. A stainless steel cylinder is fixed at a specific height as the obstacle. A high-speed camera (IDT-OS II?Series 8) captures bubble motion at 4kHz. Fluorescent polymer microspheres with a density of 1050 kg/m³ and a diameter of 20 ?m are added to the water to measure the velocity field. A light sheet is produced using a LED pulsing system to visualize the particle motion. The particle?s captured image sequence is converted to a time-related velocity field using Matlab PIVLab software.
This study employed PIV techniques to characterize the flow field during bubble-cylinder interactions. Different regimes, depending on bubble size, particle size, and velocity, were identified to enable a better understanding of the local phenomena. The PIV measurements provide further insights into local flow behavior and help characterize local mass transfer.
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