Two phase flow line pressure drop calculation

2 Two phase flow line pressure drop calculation [20] 

Homogeneous flow method (Dukler no slip method) 

This method assumes vapor and liquid are well mixed as a homogeneous mixture, no slip between them. The liquid volume foaction, density, and viscosity of the mixture are calculated by following equations, which are derived from Dukler s similanty analysis  

X is the no slip liquid volume fraction in the two phase flow piUn is the no slip density of the two phase mixture, in lh/ft3 jutins is the no slip viscosity of the two phase mixture, in cp pL is liquid viscosity, in cp pv is vapor viscosity, in cp. 

Per Eq. (15b) and Eq. (15c), the two phase mixture s density and viscosity are volume averages. Once they are known, we can calculate line pressure drop using the method outlined for single phase flow in section III. 1.2. 

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