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

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: https://nottingham-repository.worktribe.com/output/993401
• Publisher URL: http://dx.doi.org/10.1016/j.ijmultiphaseflow.2014.03.010