Thus the rapid variation of the void fraction with the gas superficial
velocities explains the need for a correlation that is sensitive
to the change in gas superficial velocity and predicts the void fraction
accurately in this region of the steep slope typically for
0 < a 6 0.7. In addition to the flow patterns, the two phase parameters
such as gas volumetric flow fraction and the slip ratio were
also observed to be influenced by the interaction of the buoyancy,
inertia and gravity forces for both orientations