Publikationsrepositorium - Helmholtz-Zentrum Dresden-Rossendorf
1 PublikationExperimental and Numerical Investigation of a Counter-Current Flow Bubble Column
Khan, H.; Kováts, P.; Zähringer, K.; Rzehak, R.
Abstract
Bubble columns are gas-liquid contactors that are used in many process-engineering applications. A counter-current liquid flow is frequently imposed to adjust the bubbles’ residence-time and thus optimize mixing and mass-transfer. The present work describes measurements in such a device together with corresponding computational fluid dynamics simulations based on the Eulerian two-fluid framework. Bubble-size and -velocity are measured by shadow-imaging for a large range of gas and counter-current liquid flow rates, as well as different nozzle sizes. The corresponding liquid flow-fields are characterized by Particle Image Velocimetry. From the large experimental database, a few cases are selected to analyze the flow structure and effects of the bubble-size. In the simulations, different models for the drag- and lift-force acting on the bubbles are evaluated. While good agreement between experiments and simulations could be achieved for the gas-fraction and gas-velocity, differences are found for the liquid-velocity, which is generally overestimated in the calculations.
Keywords: countercurrent flow bubble column; shadowgraphy; PIV; Euler-Euler two-fluid model; CFD simulation
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Chemical Engineering Science 285(2023), 119503
DOI: 10.1016/j.ces.2023.119503
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- Zweitveröffentlichung erwartet ab 09.12.2024
Permalink: https://www.hzdr.de/publications/Publ-36918