Upward interfacial friction factor in gas and high-viscosity liquid flows in vertical pipes

Joseph Xavier Francisco Ribeiro, Ruiquan Liao, Aliyu Musa Aliyu, Zilong Liu

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


In this study, experiments were carried out in a vertical 60-mm internal diameter pipe with air and oil (viscosities 100–330 mPa s) constituting the gas and liquid phases. Superficial air and oil velocity ranges used were 9.81–59.06 m/s and 0.024–0.165 m/s, respectively. Visual observations and change in slope of pressure drop– (Formula presented.) plot were used to identify flow pattern transition to annular flow. Using the experimental data as well as other reported data, a new correlation to predict interfacial friction factor in upward gas–viscous liquid annular flow regime was developed. Compared to the performance of 16 existing correlations using higher viscosity liquids, that of the new correlation was better. The performance of another correlation we derived for predictions at both low and higher low viscous showed good agreement with measurements. In addition, a neural network model to predict the interfacial friction factor involving both low and high viscous liquids was developed and it excellently described the experimental data.

Original languageEnglish
Pages (from-to)1234-1263
Number of pages30
JournalChemical Engineering Communications
Issue number9
Early online date29 Aug 2019
Publication statusPublished - 1 Sep 2020
Externally publishedYes


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