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Research Article

An empirical approach for predicting slug to pseudo-slug transition of air/water upward two-phase flow

Ghassan Abdul-Majeed1( ), Abdelsalam Al-Sarkhi2, Abdalellah O. Mohmmed3, Maha R. Hamoudi4
College of Engineering, University of Baghdad, Baghdad, Iraq
Mechanical Engineering Department, King Fahd University of Petroleum and Minerals, Academic Belt Road, Dhahran 31261, Saudi Arabia
Department of Mechanical Engineering, Middle East College, Knowledge Oasis Muscat, Muscat, Oman
Petroleum Department, University of Kurdistan Hewlêr, Erbil, Iraq
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Graphical Abstract

Abstract

Pseudo-slug (PSL) flow is an intermittent flow that has short, frothy, and chaotic slugs, which are not fully formed and have a structure velocity that falls between the conventional slug translational velocity and the wave celerity. It is important to predict the transition from conventional slug (SL) flow to PSL to determine the pressure gradients and liquid holdups. Literatures revealed that PSL can comprise a significant portion of the conventional flow pattern map, especially in highly deviated large-diameter (D) wellbores and pipelines. Several studies investigated the behavior of PSL; however, certain models were developed to predict SL/PSL transition. In the present study, an empirical model is derived employing the modified gas and liquid Froude numbers in measured dataset of Zhu (2019). The dataset consists of 125 data points, covering inclination angle (θ) from 2o to 89.4o with D of 0.1016 m. The range of superficial gas velocity is 0.124–3.313 m/s, with a constant liquid superficial velocity of 0.05 m/s. The suggested model accurately predicts all the data points and captures the expected effects of θ, D, and the gas density on the SL/PSL transition. The proposed model predicted well when validated against several independent experimental studies.

Keywords

churn flowflow pattern transitionpseudo-slug (PSL)slug (SL) flow

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Experimental and Computational Multiphase Flow
Volume 6 Issue 2,
June 2024
Pages 154-169
DOI: 10.1007/s42757-023-0170-1
Cite this article:
Abdul-Majeed G, Al-Sarkhi A, Mohmmed AO, et al. An empirical approach for predicting slug to pseudo-slug transition of air/water upward two-phase flow. Experimental and Computational Multiphase Flow, 2024, 6(2): 154-169. https://doi.org/10.1007/s42757-023-0170-1

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Received: 19 February 2023
Accepted: 28 June 2023
Published: 08 January 2024
© Tsinghua University Press 2023
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