A stripping column is used to remove a liquid contaminant from a non$-$volatile liquid; the contaminant is $$stripped$$ from the liquid. It is assumed that the gas does not significantly diffuse into the liquid. To ensure good contact between the gas and liquid, the liquid is introduced into the top of the column as droplets. Consider a $450$ micron spherical droplet of liquid falling through the column. Its slip velocity is estimated at $0\mathrm{.}6$ m$/$s$.$ There is a large excess of air introduced into the bottom of the column such that the concentration of the contaminant in the bulk of the gas may be assumed to be zero. The mole fraction of the contaminant in the liquid is $0\mathrm{.}14.$ The temperature within the column is $40$oC and its pressure is $102$ kPa. The equilibrium conditions for this system at this temperature and pressure is such that the interfacial mole fraction of contaminant in the gas is $0\mathrm{.}10.$

Gas properties:

rg $=1\mathrm{.}5$ kg$/$m$3$ mg $=2\mathrm{.}3$ x $10-5$ kg$/($ms$)$

Liquid properties:

rg $=950$ kg$/$m$3$ mL $=5\mathrm{.}0$ x $10-3$ kg$/($ms$)$

Molecular diffusivity of contaminant through air:

DAB,G $=1\mathrm{.}7$ x $10-5$ m$2/$s

Molecular diffusivity of contaminant through liquid:

DAB,L $=4\mathrm{.}4$ x $10-9$ m$2/$s

Estimate the gas film mass transfer coefficient for equimolar concentration k$$cG

Neglecting the liquid$-$side resistance, determine the molar flux of contaminant transferred from a droplet to the gas and also the rate of transport from a given individual droplet.