Campus Units

Chemical and Biological Engineering, Mechanical Engineering, Ames Laboratory

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.

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.

Copyright Owner

ASME

Language

en

File Format

application/pdf

Available for download on Friday, October 01, 2021

Published Version

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