A stream of air at 100 kPa pressure and 300 K is flowing on the top surface of a thin flat sheet of solid naphthalene of length 0.2 m with a velocity of 20 m/sec. The other data are: Mass diffusivity of naphthalene vapor in air = 6×10-6 m²/s Kinematic viscosity of air = 1.5x10-5 m²/s Concentration of naphthalene at the air-solid naphthalene interface 1x10-Skmol/m³ Recall: Nu = 0.664 Re.5 Pr0.33 (a) Develop an equation for Shi for laminar flow over a flat plate by using Chilton – Colburn analogy (b) Determine the average mass transfer coefficient over the flat plate. (c) Determine the rate of loss of naphthalene from the surface per unit width.

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Units and Dimensions

Dimensions are the basic concepts of the measurement of quantities. Units are the means of expressing the dimensions. For instance, an area has a dimension of L2 and a unit of m2.