Slug flow formed in a connecting upstream horizontal pipeline is propagated in a 189mm diameter riser at conditions where it is absent in the same riser when the gas (nitrogen) and liquid (naphtha) phases are introduced at the riser base. However, at low liquid flow rates the upstream pipeline has no significant effect on flow pattern in the riser. The experimental flow pattern transitions of Omebere-Iyari (1) are compared to published theoretical models by Taitel et al. (11) and Barnea (12). Significant disparities exist between the predictions from theory and the experimental transitions.

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