Air at 283K and 1 atm passes through a naphthalene tube of 25 mm dia. At a velocity of 15 m/s. Assuming pressure drop to be negligible, determine the length of the tube required to produce a naphthalene concentration of 0.592 kgmol/m3 at the tube outlet. The following data is provided. At a temperature of 283K, use the following data Density of air = 1.247 kg/m3 Viscosity of air = 1.76 x 10-5 kg/m.s V.P of naphthalene at 283K=0.0028 KN/m2 Diffusivity of naphthalene = 5.16 x 10-6 m2/s Sh = 0.023(Re)0.83 (Sc)0.33