Examples IV: The inner surface of a pipe is coated with a thin layer of liquid water.

Dry air at $300K,1$atm. Flows through pipe with $V_m=1\mathrm{.}9\frac{m}{s}.$ Calculate the mass

transfer coefficient for fully developed flow using Colburn analogy and Gnielinski

correlation. Compare the mass fluxes in the tube? Assume mass transfer is small

and air properties are constant.

Air $at27$:$,$

$u=15\mathrm{.}718{10}^{-6}\frac{m^2}{s}$

$,P_r=0\mathrm{.}7015,P=1\mathrm{.}77k\frac{g}{m^3}$

$CP=1005\frac{J}{k}g,k,k=0\mathrm{.}02646$

$\frac{}{k^m}$

For weter vapor: $D_{AB}=2\mathrm{.}54{10}^{-5}\frac{m^2}{s}$