Campus Units
Chemical and Biological Engineering, Mechanical Engineering
Document Type
Article
Research Focus Area
Computational Fluid Dynamics
Publication Version
Accepted Manuscript
Publication Date
2-8-2020
Journal or Book Title
Chemical Engineering Science
First Page
115546
DOI
10.1016/j.ces.2020.115546
Abstract
Buoyancy driven turbulence due to heterogeneous bubble swarms are typically encountered in bubble columns operating in the dense heterogeneous regime. The integral scales of such turbulence are much larger than single bubble pseudo-turbulence. Accurate computational fluid dynamics predictions in this regime require correctly formulated anisotropic turbulence models with closures accounting for buoyancy driven turbulence effects. In the current study, a Reynolds-stress transport equation is formulated for bubbly flows from a hyperbolic two-fluid model by Reynolds averaging. The unclosed terms generated due to Reynolds averaging are quantified using high grid resolution, two-fluid simulations for bubbly flows in a periodic domain. The relative importance of the unclosed terms are discussed from a modeling stand point. The turbulence statistics, length and time scales, energy spectra, mean momentum budget and the Reynolds stress budget are analyzed for different bubble void fractions. The results show that the unclosed terms generated due to the averaging of Drag is significant in the liquid phase Reynolds Stress budget. Moreover, the unclosed terms generated due to the averaging of Drag, Virtual mass and Buoyancy are significant in the gas phase Reynolds Stress budget.
Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial-No Derivative Works 4.0 International License.
Copyright Owner
Elsevier Ltd.
Copyright Date
2020
Language
en
File Format
application/pdf
Recommended Citation
Panicker, Nithin; Passalacqua, Alberto; and Fox, Rodney O., "Computational study of buoyancy driven turbulence in statistically homogeneous bubbly flows" (2020). Chemical and Biological Engineering Publications. 410.
https://lib.dr.iastate.edu/cbe_pubs/410
Comments
This is a manuscript of an article published as Panicker, N., A. Passalacqua, and R. O. Fox. "Computational study of buoyancy driven turbulence in statistically homogeneous bubbly flows." Chemical Engineering Science (2020): 115546. DOI: 10.1016/j.ces.2020.115546. Posted with permission.