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2. (35 points total) Air at 1 atm and 100C flows through a straight, 5-cm-diameter, circular tube, cast from naphthalene, at a Reynolds number of 1500. Air entering the tube has an established laminar-flow velocity profile. Properties are given as follows: Vapor pressure of naphthalene = 10 torr Viscosity of air = 0.0215 cP Where I poise = 1 g/(cm.s) Molar density of air = 0.0327 kmol/m Diffusivity of naphthalene (A) in air (B) - 0.94x10 m/s. If pressure drop through the tube is negligible, calculate the average mole fraction of naphthalene in the exiting air. The total length of the naphthalene tube is 3.73 m. Over a length of a tube (x) where mass transfer occurs from the inside surface area to the fluid, average Sherwood number for a fully developed flow is as follows: Pe 0.0668 x/D Shavg = 3.66+ Pe 72/3 1+0.04 x/D