Effects of Liquid Velocity on Pressure Gradient, Slip and Interfacial Friction Factor in Annular Flow in Horizontal Pipe

Uche Osokogwu


Experimental investigations on annular flow behaviour in two-phase (air/water) flow in horizontal pipe were conducted using 2-inch (0.0504m) with a total length of 28.68m closed loop system. The emphasis from the experiments were on pressure gradient, slip and interfacial friction factor in annular flow. For interfacial friction factor, the entrainment, gas quality, the droplets and slip mixture density values were obtained through the experimental results which were substituted to determine it. In all, effects of liquid velocity were felt, as increase in superficial liquid velocity, increases the interfacial friction factor and pressure gradient in annular flow in horizontal pipes. More so, increase in superficial gas velocity, reduces the interfacial friction factor. Thus, interfacial friction factor decreases with increases in superficial gas velocity, while the pressure gradient increases with increase in superficial liquid velocity. The lower the superficial liquid velocity, the higher the slip but the lower the pressure gradient. Likewise, the lower the superficial liquid velocity, the more ripple waves obtained while the higher the superficial liquid velocity, the more disturbance waves in annular flow in horizontal pipe from the experiments.


Annular Flow; Friction Energy; Velocity; Slippage

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A. E. Dukler, Wicks Moye and Cleveland “Frictional Pressure Drop in Two-Phase: A. A Comparison of Existing Correlations for Pressure Loss and Hold Up” AIChE Journal, Vol. 10 (1), pp. 38-43, (1964).

A. Setyawan., Indarto and Deendarlianto “The Effect of the Fluid Properties on the Wave Velocity and Wave Frequency of Gas-Liquid Annular Two-Phase Flow in a Horizontal Pipe” Experimental Thermal and Fluid Science, ELSEVIER, Vol. 71, pp 25-41, (2016).

H. D. Beggs and J. P. Brill “A Study of Two-Phase Flow in Inclined Pipes” Journal of Petroleum Technology, Vol. 25, (5), pp. 607-617, (1973).

H. L. McClusky., M. V. Holloway., D. E. Beasley and J. M. Ochterbeck “Continuous Wavelet Transforms of Instantaneous Wall Pressure in Slug and Churn Upward Gas-Liquid Flow” Journal of Fluid Engineering, Vol. 124, pp. 625-633, (2002).

I. Mantilla, “Mechanistic Modelling of Liquid Entrainment in Gas in Horizontal Pipes” PhD thesis, University of Tulsa, Tulsa, Oklahoma, (2008).

M. A. Aliyu., L. Lao and H. Yeung “A Comparative Analysis of Interfacial Friction Factor Correlation for Adiabatic Co-Current Gas-Liquid Annular Two-Phase Flow in Large Diameter Pipes” Proc., World Congress on Mechanical, Chemical and Material Engineering, Barcelona, Spain, July 20-21, No. 280, pp. 281-289, (2015).

N. R. Kesana., J.M. Throneberry., B. S. Mclaury., S. A. Shirazi, and E. F. Rybicki “Effect of Particle Size and Viscosity on Erosion in Annular and Slug Flow” Proceedings of the ASME 2012 International Mechanical Engineering Congress & Exposition IMECE2012, November 9-15, 2012, Houston, Texas, USA, (2012).

R. Kumar., M. Gottmann, and K. R. Sridhar “Film Thickness and Wave Velocity Measurements in Vertical Duct” Transactions of ASME 124, pp. 634-642, (2002).

D. Schubring and T. A. Shedd “A Model Pressure Loss, Film Thickness and Entrained Fraction for Gas-Liquid Annular Flow” International Journal of Heat and Fluid Flow, Vol. 32, 730-739, 2011.

DOI: http://dx.doi.org/10.24018/ejers.2018.3.8.819


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