In gas absorption process, water and treated gas were flow out from the column through a $50$ mm i$.$d of a smooth pipe at flowrates of $3\mathrm{.}0$ and $0\mathrm{.}15$ kg$/$s respectively. If the mean temperature and pressure were $350$ K and $150$ kN$/$m$2,$

Determine flow pattern for multiphase in the pipe.

$($Given viscosities of treated gas $=0\mathrm{.}017$ x $10-3$ Ns$/$m$2$ and water $=0\mathrm{.}38$ x $10-3$ Ns$/$m$2$ and MW gas $=34$ kg$/$kmol$)$

Determine hold$-$up in the column in terms of a parameter X$.$