An attempt to connect the gas void fraction with flow patterns in three-phase air - water - oil flow was undertaken in the paper. A comparison of the measured and calculated gas void fractions for several models were described. The best agreement between the measured and calculated gas void fractions were obtained for strongly dispersed water - oil flow.
In the paper investigations results of three-phase air - water - oil up-flow in a vertical pipe are presented. The total pressure drop measurements including the hydrostatic and frictional components of pressure drop for three-phase flow were described. The influence of velocity and void fraction of each phase on pressure drop was determined. The method for pressure drop prediction was given.
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