Campus Units
Chemical and Biological Engineering, Mechanical Engineering
Document Type
Article
Research Focus Area
Computational Fluid Dynamics
Publication Version
Accepted Manuscript
Publication Date
10-2020
Journal or Book Title
Journal of Fluids Engineering
Volume
142
Issue
10
First Page
101402
DOI
10.1115/1.4047806
Abstract
A numerical investigation is performed on buoyancy-driven homogeneous and heterogeneous bubbly flows to compare the bulk gas–liquid heat transfer effectiveness for Prandtl (Pr) numbers 0.2–20 and void fractions ⟨αg⟩ 0.3–0.5. For this purpose, transient two-fluid model simulations of bubbles rising in a stagnant pool of liquid are conducted in a rectangular box by applying periodic boundary conditions to all the sides. The temperature difference (ΔT) between gas and liquid phase is averaged over the rectangular box and monitored with respect to time, the heat transfer rate is studied based on the time at which the ΔT tends to zero. The results of numerical study show that at low Pr numbers, faster decay of ΔT is observed for homogeneous flow of bubbles indicating higher heat transfer rate in comparison with the heterogeneous flow of bubbles for the same void fraction. On the contrary, for high Pr numbers, higher heat transfer rate is observed in heterogeneous flow compared to the homogeneous. The comparison of heat transfer behavior between different void fractions for heterogeneous flow show that, for low Pr numbers higher heat transfer rate is achieved for void fraction 0.4 in comparison with void fraction 0.5. And for high Pr numbers, higher heat transfer is observed for void fraction 0.5 in comparison with void fraction 0.4.
Copyright Owner
ASME
Copyright Date
2020
Language
en
File Format
application/pdf
Recommended Citation
Panicker, Nithin S.; Passalacqua, Alberto; and Fox, Rodney O., "Computational Study of the Effect of Homogeneous and Heterogeneous Bubbly Flows on Bulk Gas–Liquid Heat Transfer" (2020). Chemical and Biological Engineering Publications. 444.
https://lib.dr.iastate.edu/cbe_pubs/444
Comments
This is a manuscript of an article published as Panicker, Nithin S., Alberto Passalacqua, and Rodney O. Fox. "Computational Study of the Effect of Homogeneous and Heterogeneous Bubbly Flows on Bulk Gas–Liquid Heat Transfer." Journal of Fluids Engineering 142, no. 10 (2020). DOI: 10.1115/1.4047806. Posted with permission.