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Investigation of the effects of pipe diameter of internal multiphase flow on pipe elbow vibration and resonance.

Asiegbu, Nkemjika Mirian; Hossain, Mamdud; Droubi, Ghazi Mohamad; Islam, Sheikh Zahidul

Authors

Nkemjika Mirian Asiegbu



Abstract

Computational fluid dynamics modelling of internal two-phase flow induced transient forces at 90° elbows have been carried out to evaluate the effect of pipe diameter on the characteristics of multiphase flow induced vibration. Simulations of two-phase flows of slug, cap bubbly and churn induced vibration at a pipe elbow were carried out using the volume of fluid model for the two-phase flows and the k – ε model for turbulence. Modal analysis has been carried out to evaluate the risk of resonance. Results were compared across three geometrically similar pipes of different diameters. Simulation results showed that the behaviours of the flow induced forces at the pipe elbow as a function of gas velocity for internal diameters of 0.0525 and 0.2032 m are similar. However, the multiphase flow induced force characteristics are different in the 0.1016 m diameter (intermediate) pipe. It can be attributed to the transition behaviour of gas–liquid two-phase flows caused by Taylor instability in an intermediate sized pipe. The predicted root-mean-square flow induced forces as a function of Weber number were correlated with an existing empirical correlation for a wider range of pipe sizes and gas volume fractions between 40% and 80%. Furthermore, the pipe natural frequencies increase with the increase of gas volume fraction in smaller pipes and the resonance risk increases with the increase of pipe diameter.

Citation

ASIEGBU, N.M., HOSSAIN, M., DROUBI, G.M. and ISLAM, S.Z. 2023. Investigation of the effects of pipe diameter of internal multiphase flow on pipe elbow vibration and resonance. Proceedings of the Institution of Mechanical Engineers, part E: journal of process mechanical engineering [online], 237(4), pages 1319-1330. Available from: https://doi.org/10.1177/09544089221115520

Journal Article Type Article
Acceptance Date Jun 20, 2022
Online Publication Date Jul 25, 2022
Publication Date Aug 31, 2023
Deposit Date Aug 2, 2022
Publicly Available Date Aug 2, 2022
Journal Proceedings of the Institution of Mechanical Engineers, Part E: Journal of process mechanical engineering
Print ISSN 0954-4089
Electronic ISSN 2041-3009
Publisher SAGE Publications
Peer Reviewed Peer Reviewed
Volume 237
Issue 4
Pages 1319-1330
DOI https://doi.org/10.1177/09544089221115520
Keywords Two-phase flow induced vibration; Numerical modelling; Force fluctuations; Natural frequency; Resonance
Public URL https://rgu-repository.worktribe.com/output/1721759
Related Public URLs https://rgu-repository.worktribe.com/output/1724600

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