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This study presents new measured slug liquid holdup data for liquid viscosity ranging from 200 to 800 mPa s. The experiments were conducted using two different large pipe diameters (0.08 and 0.1 m) and pipe inclination angles of 0°, 30°, 60° and 90° from horizontal. To our best knowledge, most of the existing experimental data were limited to either vertical or horizontal flow and mostly performed using small pipe diameters. Based on the measured data, a new unified empirical correlation is developed to predict slug liquid holdup for viscous two-phase flow in horizontal, vertical and inclined pipes. The proposed correlation is simple and fully consistent with the trends of published experimental data. This study also investigates in details the performance of the existing liquid holdup correlations using different flow conditions. The investigation reveals several discrepancies associated with these correlations. Based on statistical analysis, the proposed correlation performs best as compared to the existing correlations using both the present measured data and data from three independent sources. Keywords Slug liquid holdup • Two-phase flow • High liquid viscosity • Inclined flow List of symbols A, C Constants d Pipe diameter (m) g Acceleration gravity (m/s 2) N Dimensionless number H Slug liquid holdup N f Inverse viscosity number N Re Reynolds number T Temperature (°C) V Velocity (m/s) Greek letters ɛ Residual error ɸ Correlation independent parameter σ Surface tension (N/m) µ Viscosity (kg/m s) (Pa s) ρ Density (kg/m 3) Δρ Density difference (kg/m 3) θ Inclination angle from horizontal (°)

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IJPE is an interdisciplinary and refereed journal, a think tank that fosters innovative solutions to design efficient petroleum operations. It promotes feasible system design, development, and management bringing together sustainable technologies, the people, and sound processes. It provides cross learning between various scientific and technological, as well as business and economics, disciplines comprising exploration, drilling, production, and processing, taking into account environment, health and safety, and public concerns. Contents: IJPE publishes original papers, review papers, technical reports, case studies, conference reports, management reports, book reviews, notes, commentaries, and news. Special Issues devoted to important topics in Petroleum Engineering will occasionally be published.