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The present study analyzes the influence of the physical properties of Newtonian and non-Newtonian fluids, such as density, effective viscosity and surface tension, as well as operational parameters of the piping, such as diameter, length and angle of inclination, on the drift velocity for two-phase gas-liquid flow. This study comprises experimental and Computational Fluid Dynamic (CFD) approaches. The simulation model consists of half a section of a circular pipe with a symmetry plane. This model was calibrated through a mesh independence test, which considered experimental and literature data as benchmarking values for both low and high viscosity Newtonian fluids. The results obtained through the CFD model showed good agreement with the experimental data gathered for the present study, keeping the experimental deviations under 30% for all cases considered. The relationship between the Froude number (Fr) and the Viscosity number (Nvis) was studied and an inverse exponential tendency was found for all the parameters and fluids tested, which agrees with the models proposed in literature. The data gathered for all fluids on the drift velocity’s behavior against operational parameters such as length, diameter and inclination, showed the influence of the governing forces for each case based on dimensionless analysis using Eötvos (Eö) and Reynolds (Re) numbers. For dominant capillary or viscous forces on the system, the drift velocity changed with the variation of these parameters. However, it was found that for dominant inertial and gravitational forces, the drift velocity maintained a constant value regardless of the operational settings. Finally, it was observed that the rheological nature found for the non-Newtonian fluids has a significant influence on the drift velocity’s behavior, deviating its patterns from the Newtonian fluids as the effective viscosity changed.

Experimental and CFD Modelling of the Drift Flux in Two-Phase Air(Non) Newtonian Slug-Flow Pattern Flow along Horizontal and Inclined Pipelines