WAVE COALESCENCE AND ENTRAINMENT IN VERTICAL ANNULAR TWO-PHASE FLOW

A rigorous model for wave coalescence has been derived. The wave coalescence process
has also been modelled by a Monte-Carlo technique. The results of the theories are in general
in good agreement with the available experimental data. It had been noted that coalescence of
two waves was accompanied by a large burst of entrainment. The above coalescence theory has
been used to calculate that component of entrainment that is due to coalescence. Comparison
of this and experimental data shows that the entrainment due to coalescence can be a significant
portion of the total entrainment