A critical analysis of drag force modelling for disperse gas-liquid flow in a pipe with an obstacle
Research output: Contribution to journal › Research article › Contributed › peer-review
Contributors
Abstract
The accuracy of the modelling of gas–liquid flows depends strongly on a suitable modelling of the interfacial forces. Among these, drag is dominant. Most drag models reported in the literature have been derived and validated only for laminar or low-turbulent flow conditions. In this study, we numerically evaluated several drag models from the literature for high-turbulent gas–liquid flow around an obstacle in a pipe that creates a distinct vortex region. We performed Computational Fluid Dynamics (CFD) simulations and compared the void fraction and gas velocity profiles with experimental data obtained by ultrafast X-ray computed tomography. We found that all models, except Schiller&Naumann and Feng, predicted the void fraction well compared to experimental data upstream of the obstacle, i.e., for a developed two-phase pipe flow with axial symmetry. However, the void fraction downstream is greatly overestimated by all models except those that appropriately consider the turbulence effects. Based on the results, a hybrid drag model is proposed that significantly improves the prediction of the void fraction.
Details
Original language | English |
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Article number | 117007 |
Journal | Chemical engineering science |
Volume | 246 |
Publication status | Published - 31 Dec 2021 |
Peer-reviewed | Yes |
External IDs
ORCID | /0000-0001-9264-5129/work/173054098 |
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Keywords
ASJC Scopus subject areas
Keywords
- Bubbly flow, CFD, Drag force coefficient, Hybrid drag model, Turbulence, Vortex