A new model for viscous oil-water eccentric core annular flow in horizontal pipes

Jie Sun, Liejin Guo*, Jiqiang Fu, Jiaqiang Jing, Xiaoyun Yin, Yingda Lu, Amos Ullmann, Neima Brauner

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Eccentric core-annular flow is encountered in water-lubricated transport of highly viscous oil in horizontal pipes. The core eccentricity results from the tendency of the phases to stratify due to a buoyant force that results from their different densities, whereby a shape of a circular core may not be maintained. To model such a flow configuration, a new three-zone model is proposed based on the Two-Fluid approach. The model's performance was examined by comparing its predictions with a large data set of pressure gradient and water holdup values obtained under different experimental conditions. It is shown that the proposed model enables better agreement with the data compared to other models available in the literature. Thus, the proposed approach appears to be a useful framework for modeling viscous oil-water eccentric core-annular flows. It can also be applied for other types of Newtonian/non-Newtonian or non-Newtonian/non-Newtonian liquid-liquid core flows encountered in industrial applications.

Original languageEnglish
Article number103892
JournalInternational Journal of Multiphase Flow
StatePublished - Feb 2022


  • Eccentric core annular flow
  • Pressure gradient
  • Two-fluid model
  • Viscous oil-water


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