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List of symbols Variables A Area, m 2 c i Constant and exponent, non-dimensional C 0 Distribution parameter, non-dimensional d Diameter, m dA Cross-sectional area element, m 2 g Gravitational acceleration, m/s 2 G Mass velocity, kg/m 2 s j Superficial velocity, m/s K Momentum coefficient, non-dimensional T Temperature, °C u In situ velocity, m/s u gj Drift parameter, m/s V z Axial component of velocity, m/s x Vapor quality, non-dimensional Dimensionless parameters Fr Froude number We Weber number X tt Martinelli parameter Greek letters α Void fraction, non-dimensional β Volumetric gas fraction, non-dimensional ε Mean absolute deviation, non-dimensional γ 10 Fraction of data predicted within ± 10 % λ Capillary length, m μ Dynamic viscosity, kg/m s ρ Density, kg/m 3 σ Surface tension, N/m θ Inclination relative to horizontal plane, degrees ξ Shedd [21] parameter, non-dimensional

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