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Investigation of slug-churn flow induced transient excitation forces at pipe bend.

Hossain, Mamdud; Chinenye-Kanu, Nkemjika Mirian; Droubi, Ghazi Mohamad; Islam, Sheikh Zahidul

Authors

Mamdud Hossain

Nkemjika Mirian Chinenye-Kanu

Ghazi Mohamad Droubi

Sheikh Zahidul Islam

Abstract

Numerical simulations of two-phase flow induced fluctuating forces at a pipe bend have been carried out to study the characteristics of multiphase flow induced vibration (FIV). The multiphase flow patterns and turbulence were modelled using the volume of fluid (VOF) method and the k-ϵ turbulence model respectively. Simulations of seventeen cases of slug and churn flows have been carried out showing the effects of superficial gas and superficial liquid velocities. The simulations results show good agreement of the volume fraction fluctuation frequencies of slug and churn flows with the reported experiment. In addition, the vibration characteristics of the excitation force have been accurately captured. The simulation results show that the predominant frequency of fluctuations of force decreases and the RMS of force fluctuation increases with the increase of superficial gas velocity. On the other hand, both predominant frequency and the RMS of force fluctuations increases with the increase of superficial liquid velocity. Increase of gas fraction narrows the range of frequency ranges, while increasing the liquid expands the frequency ranges of force fluctuations.

Journal Article Type Article
Journal Journal of fluids and structures
Print ISSN 0889-9746
Electronic ISSN 1095-8622
Publisher Elsevier
Peer Reviewed Peer Reviewed
Institution Citation HOSSAIN, M., CHINENYE-KANU, N.M., DROUBI, G.M. and ISLAM, S.Z. [2019]. Investigation of slug-churn flow induced transient excitation forces at pipe bend. Journal of fluids and structures [online], (accepted).
Keywords Flow induced vibration; Numerical modelling; Pipe bend; Slug/churn flow; Force fluctuations

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