An Evaluation of the Performance of Mixture Viscosity Correlations on the Prediction of Pressure Drop in Horizontal dispersed Oil-Water Flow
This work aims to improve the prediction of pressure drop in dispersed oil-water flow in horizontal pipes. The homogeneous model is commonly used for predicting the pressure gradient where the mixture of oil and water is treated as a pseudo-fluid. Currently, large numbers viscosity correlations are available in the literature. In this study, comparison of the performance of 14 viscosity correlations were evaluated against 484 experimental pressure drop data points. This work is considered the most comprehensive and unbiased comparison since the data collected from 10 different sources and covered wide range of pipe diameters, oil viscosities, densities and pipe materials. The comparisons revealed that the performances of the viscosity correlations in predicting the pressure drop are very different. Four viscosity correlations are recommended for their acceptable prediction of pressure drop for horizontal dispersed oil-water flow. These are Taylor (1932), Pal and Rhodes (1989) Einstein (1906, 1911) and Pal Eq. 16 (2001) correlations. The worst agreement was obtained using Yaron and Gal-Or (1972) and Al-Sarkhi (2015) correlations.