Mass Transfer from
a Pipe Wall. Pure water at 26.1C is flowing at a velocity of 0.0305 m/s in a
tube having an inside diameter of 6.35 mm. The tube is 1.829 m long, with the
last 1.22 m having the walls coated with benzoic acid. Assuming that the
velocity profile is fully developed, calculate the average concentration of
benzoic acid at the outlet. Use the physical property data from Example 21.3-2.
[Hint: First, calculate the Reynolds number D__/_. Then,
calculate NReNSc (D/L)(_/4), which is the same as
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