M. Adbulkadir
Liquid film thickness behaviour within a large diameter vertical 180° return bend
Adbulkadir, M.; Azzi, A.; Zhao, D.; Lowndes, I.S.; Azzopardi, B.J.
Authors
A. Azzi
D. Zhao
IAN LOWNDES ian.lowndes@nottingham.ac.uk
Associate Professor and Reader in Environmental Engineering
B.J. Azzopardi
Abstract
Experimental results of liquid film thickness distribution of an air-water mixture flowing through a vertical 180° return bend are reported. Measurements of liquid film thickness were achieved using flush mounted pin and parallel wire probes. The bend has a diameter of 127. mm and a curvature ratio (R/. D) of 3. The superficial velocities of air ranged from 3.5 to 16.1. m/s and those for water from 0.02 to 0.2. m/s. At these superficial velocity ranges, the flow pattern investigated in this work focused on churn and annular flows. It was found that at liquid and gas superficial velocities of 0.02. m/s and 6.2. m/s, respectively, the averaged liquid film thickness peak at 90°. At gas superficial velocity of 16.1. m/s, the relationship between them is linear due to the shear forces overcoming gravity. Additionally, it was found that deposition of entrained droplets keeps the liquid film on the outside of the bend. The results of polar plots of average liquid film thickness in the bend showed that the distribution of the liquid film is not symmetrical with thicker films on the inside of the bend due to the action of gravity. Experimental results on average liquid film thickness showed good agreement with the simulation data reported in the literature. © 2013 Elsevier Ltd.
Citation
Adbulkadir, M., Azzi, A., Zhao, D., Lowndes, I., & Azzopardi, B. (2014). Liquid film thickness behaviour within a large diameter vertical 180° return bend. Chemical Engineering Science, 107, 137-148. https://doi.org/10.1016/j.ces.2013.12.009
Journal Article Type | Article |
---|---|
Acceptance Date | Dec 7, 2013 |
Online Publication Date | Dec 16, 2013 |
Publication Date | Apr 7, 2014 |
Deposit Date | Aug 1, 2016 |
Publicly Available Date | Mar 29, 2024 |
Journal | Chemical Engineering Science |
Print ISSN | 0009-2509 |
Electronic ISSN | 1873-4405 |
Publisher | Elsevier |
Peer Reviewed | Peer Reviewed |
Volume | 107 |
Pages | 137-148 |
DOI | https://doi.org/10.1016/j.ces.2013.12.009 |
Keywords | Churn and annular flows; Liquid film thickness; 180° Bend; Large diameter; Pin probes; Wire probes |
Public URL | https://nottingham-repository.worktribe.com/output/727404 |
Publisher URL | http://www.sciencedirect.com/science/article/pii/S000925091300804X |
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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nd/4.0
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