From Eqs. (5) and (6), Dh is channel hydraulic diameter, jLS and
jGS are liquid and gas superficial velocities, respectively, qL and qG
are liquid and gas densities, respectively, and lL and lG are liquid
and gas viscosities, respectively.
The flow visualization indicated that flow behaviors under the
present conditions (superficial Reynolds numbers of gas and liquid
ranging between 54–142 and 131–373, respectively) can be significantly
affected by the change in inlet section. The flow pattern
identification was mostly observed under a given flow condition.
Fig. 7 shows flow patterns at different locations.