Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN: 9781259696527
Author: J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher: McGraw-Hill Education
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- A very thin polymeric coating of thickness 0.1 mm uniformly coats a rectangular surface. The rectangular surface has a length of 20 cm and a width of 10 the coating contains a solvent that must be evaporated away from the coating in order to cure the coating. Initially, there is 0.001 mole of solvent per cm3 of coating loaded in the coating. A heated plate just beneath the surface maintains the coating at a uniform temperature of 408C, and the vapor pressure exerted by the solvent is 0.05 atm at 408C. Air gently flows parallel to the surface at a velocity of 5.0 cm/s. The surrounding air at 1.0 atm total system pressure and 208C represents an ‘‘infinite sink’’ for
mass transfer . You may neglect any molecular diffusion of the solvent through the very thin polymeric film and focus only on the convection aspects of the problem. The diffusion coefficient of species in air at 208C is 0:1 cm2=s.
- Determine the Reynolds, Schmidt, and Sherwood numbers associated with this
What is the film mass-transfer coefficient, ky, (mole fraction based driving force) associated with this process?
. How long will it take for the solvent to completely evaporate from the coating?
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