A 1-m square thin plate of solid
naphthalene is oriented parallel to a stream of air flowing at 20 m/s. The air
is at 310 K and 1.013 105 Pa.
The naphthalene remains at 290 K; at this temperature, the diffusivity of
naphthalene in air is 5.61 m2/s and
its vapor pressure is 26 Pa. Determine
a. the value of the mass-transfer coefficient
at a point 0.3 m downstream from the leading edge.
b. the moles of naphthalene per hour lost
from the section of the plate 0.50.75 m downstream from the leading edge.
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