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Persistence of frequency in gas–liquid flows across a change in pipe diameter or orientation

Azzopardi, Barry J.; Ijioma, Amadi; Yang, Shounan; Abdulkareem, Lokman A.; Azzi, Abdelwahid; Abdulkadir, Mukhtar

Authors

Barry J. Azzopardi

Amadi Ijioma

Shounan Yang

Lokman A. Abdulkareem

Abdelwahid Azzi

Mukhtar Abdulkadir



Abstract

From a study of the characteristics of structures across a 67/38 mm sudden contraction, using air/silicone oil flows, it has been found that frequencies of the structures (mainly slugs) persist across the contraction. This is in contrast to the velocities and lengths which increase as they move into the smaller diameter pipe. These observations were found for both vertical and 5° upward orientations. A similar persistence of frequency has been found from four other sources in the literature: a vertical (gradual) contraction; a horizontal Venturi; and two cases of horizontal pipe, 90° bend and vertical riser combination. The latter were at two contrasting conditions: (i) at atmospheric pressure with air/water in small diameter (34 mm) pipes; (ii) at 20 bar in larger diameter pipes (189 mm) using nitrogen and naphtha.

Citation

Azzopardi, B. J., Ijioma, A., Yang, S., Abdulkareem, L. A., Azzi, A., & Abdulkadir, M. (2014). Persistence of frequency in gas–liquid flows across a change in pipe diameter or orientation. International Journal of Multiphase Flow, 67, https://doi.org/10.1016/j.ijmultiphaseflow.2014.03.010

Journal Article Type Article
Acceptance Date Mar 27, 2014
Online Publication Date May 1, 2014
Publication Date Dec 1, 2014
Deposit Date Jul 29, 2016
Publicly Available Date Jul 29, 2016
Journal International Journal of Multiphase Flow
Print ISSN 0301-9322
Electronic ISSN 0301-9322
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 67
DOI https://doi.org/10.1016/j.ijmultiphaseflow.2014.03.010
Keywords Sudden contraction; Venturi; Bends; Gas/liquid; Void fraction; Frequency; Vertical; Inclined; ECT
Public URL http://eprints.nottingham.ac.uk/id/eprint/35557
Publisher URL http://dx.doi.org/10.1016/j.ijmultiphaseflow.2014.03.010
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0





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