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 thisWhat 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?

Evaporation of solvent from the rectangular surface into the air System pressure, P = 1 atm…

Answered: A very thin polymeric coating of…

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:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Chapter1: Introduction

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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, k_y, (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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