Two-phase slug flows in helical pipes: Slug frequency alterations and helicity fluctuations

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dc.contributor.authorGourma, Mustapha
dc.contributor.authorVerdin, Patrick G.
dc.date.accessioned2016-08-17T15:54:33Z
dc.date.available2016-08-17T15:54:33Z
dc.date.issued2016-07-29
dc.description.abstractAir-water numerical simulations in the slug flow regime have been performed in horizontal helical pipes and the effects of geometries on the flow regime have been investigated. Depending on the length of the helix, outlet slug frequencies have been reduced with various degrees of efficiency. Correlations between mean tangential velocity and helicity density fluctuations have been identified and investigated qualitatively. These flow fields show smaller time scales than those obtained in volume fractions fluctuations. Shifts observed in the tangential velocity and mean helicity fluctuations to smaller time scales (high frequencies) are associated with regime transitions. For a slug flow undergoing a continuous transition to the annular flow regime, it is shown that the presence of slower (low frequencies) helicity fluctuations is attributed to the variations in the axial velocity. Finally, the analysis of the helicity at gas-liquid interface confirms the presence of the mixing zone at the slug front.en_UK
dc.identifier.citationM. Gourma, P.G. Verdin, Two-phase slug flows in helical pipes: Slug frequency alterations and helicity fluctuations, International Journal of Multiphase Flow, Volume 86, November 2016, Pages 10-20en_UK
dc.identifier.issn0301-9322
dc.identifier.urihttp://dx.doi.org/10.1016/j.ijmultiphaseflow.2016.07.013.
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/10341
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution-Non-Commercial-No Derivatives 4.0
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectHelical pipesen_UK
dc.subjectSlug flowen_UK
dc.subjectSlug frequencyen_UK
dc.subjectVolume of fluid VOFen_UK
dc.subjectHelicity densityen_UK
dc.subjectHelicity fluctuationsen_UK
dc.titleTwo-phase slug flows in helical pipes: Slug frequency alterations and helicity fluctuationsen_UK
dc.typeArticleen_UK

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