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Experimental investigation of a vertically downward two-phase air-water slug flow

Bouyahiaoui, Hiba; Azzi, Abdelwahid; Zeghloul, Ammar; Hasan, Abbas; Berrouk, Abdallah Sofiane


Hiba Bouyahiaoui

Abdelwahid Azzi

Ammar Zeghloul

Abdallah Sofiane Berrouk


The present experimental work investigates the vertical downward two-phase slug flow in a transparent vertical pipe of 34 mm internal diameter. The gas and liquid superficial velocities are in the range of 0–3.27 m/s and 0.015–1.4 m/s respectively. The cross-sectional averaged void fraction has been measured at seven positions along the test section by the intermediary of the conductance probe technique.

The results of the development of the void fraction time-series and Probability Density Function along the tube are presented. A good accordance was found between the experimental data and the line transitions of the flow pattern map proposed by (Usui, 1989). We also present results of the structure velocity of the slug flow, where the distribution parameter is found to be lower than unity. A new correlation for the prediction of slug frequencies is also proposed. It agrees well with the data collected in this study with +_10% error.


Bouyahiaoui, H., Azzi, A., Zeghloul, A., Hasan, A., & Berrouk, A. S. (2018). Experimental investigation of a vertically downward two-phase air-water slug flow. Journal of Petroleum Science and Engineering, 162, 12-21.

Journal Article Type Article
Acceptance Date Dec 11, 2017
Online Publication Date Dec 12, 2017
Publication Date 2018-03
Deposit Date Sep 16, 2019
Journal Journal of Petroleum Science and Engineering
Print ISSN 0920-4105
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 162
Pages 12-21
Keywords Downward; Slug; Void fraction; Vertical; Frequency; Characteristics
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