• Afshin J. Ghajar
Part of the SpringerBriefs in Applied Sciences and Technology book series (BRIEFSAPPLSCIENCES)


This chapter briefly presents the entrainment mechanisms and the different correlations used to predict liquid entrainment fraction in gas–liquid annular flow. An illustrative example for calculation of liquid entrainment fraction is also provided.


Two-phase flow Gas-liquid Air-water Horizontal flow Vertical upward flow Upward inclined flow Pipe orientation Entrainment Entrainment mechanisms Liquid entrainment fraction Annular flow High system pressure Weber number Predictor and corrector technique Correlations 


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© The Author(s), under exclusive license to Springer Nature Switzerland AG 2020

Authors and Affiliations

  • Afshin J. Ghajar
    • 1
  1. 1.School of Mechanical and Aerospace EngineeringOklahoma State UniversityStillwaterUSA

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