Question

Problem 1. (20 Points) Air at 100°C, 1 atm, and a free-stream velocity of 5 m/s flows over a 3- m-long, thin, flat plate of naphthalene, causing it to sublime. (a) Determine the length over which a laminar boundary layer persists. (b) For that length, determine the rate of mass transfer of naphthalene into air. (c) At the point of transition of the boundary layer to turbulent flow, determine the thicknesses of the velocity and concentration boundary layers. Assume the following values for physical properties: Vapor pressure of napthalene 10 torr Viscosity of air = 0.0215 cP Molar density of air 0.0327 kmol/m3 Diffusivity of napthalene in air 0.94 x 10 m'/s Reynolds number at transition = 5* 10° 8 4.96 r0.5 Re, The thickness of velocity boundary layer 4/8=1/N 1/3 Sc The thickness of concentration boundary layer

Problem 1: Air at 100 degrees Celsius, 1 atm and a free stream velocity of 5 m/s flows over a 3 meter long, thin, flat plate of naphthalene, causing it to sublime...

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Answer 1

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