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A critical analysis of drag force modelling for disperse gas-liquid flow in a pipe with an obstacle.
- Source :
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Chemical Engineering Science . Dec2021, Vol. 246, pN.PAG-N.PAG. 1p. - Publication Year :
- 2021
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Abstract
- • The capabilities of different drag models under high turbulence /vortex flow conditions are shown. • Impacts of turbulence effects on drag modelling are presented. • A hybrid drag model is proposed for high turbulence flow conditions. • Two-phase flow hydrodynamics under complex flow conditions is analyzed. • Gas velocity and void fraction predictions are compared with experimental data. 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. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00092509
- Volume :
- 246
- Database :
- Academic Search Index
- Journal :
- Chemical Engineering Science
- Publication Type :
- Academic Journal
- Accession number :
- 152606237
- Full Text :
- https://doi.org/10.1016/j.ces.2021.117007