Problem 5. Mass transfer coefficient Estimate the mass transfer coefficient, ke, in a wetted-wall column (wetted with benzene) for the transfer of benzene into carbon dioxide at 0C. The carbon dioxide gas velocity through the column is 1.25 m/s. The diameter of the column is 0.16 m. Assume that the benzene concentration in the carbon dioxide gas is very low. Mass density of CO2 = 1.966 kg/m Viscosity of CO2 = 1.35 x 10 kg/m's Diffusivity of benzene in CO2 = 5.28 x 10 m/s Molecular weight of CO2 = 44 g/g mol Molecular weight of benzene = 78 g/g mol Note that the friction factor, f, can be correlated with the Reynolds number, Re, as follows: f = 0.023 Re-0.2 for Re = 5,000 200,000 Calculate ke based on (a) the Reynolds Analogy, (b) the Chilton-Colburn Analogy. Which mass transfer coefficient is more accurate and why