Effective viscosity of multiphase flow

AVEVA Process Simulation calculates the effective viscosity of multiphase flow by using the following volumetric average proposed by Govier and Aziz1:

where

mV, mL1, and mL2 are the viscosities of the vapor, liquid 1, and liquid 2 phases, respectively

qV, qL1, and qL2 are the vapor, liquid 1, and liquid 2 phase fractions of the mixture, respectively

Reference

1. Govier, G.W.; Aziz, K. The Flow of Complex Mixtures in Pipes; Van Nostrand Reinhold Company: New York, 1972.