Please state when values are sources from an appendix/table. Using the results from part (a), how long will it take for thepaint to completely dry?d. What are the hydrodynamic (8) and concentration boundary-layer (8) thicknesses at x=L=1.5 m? How does thiscompare to H, the height of the drying chamber?What is the new required air flow rate (m³/min) if the desiredsolvent mass-transfer rate is 150 g/min? 28.4 A thin (1.0-mm-thick) coat of fresh paint has just beensprayed over a 1.5-m by 1.5-m square steel body part, whichapproximates a flat surface. The paint contains a volatile solventthat initially constitutes 30 wt% of the wet paint. The initialdensity of the wet paint is 1.5 g/cm³. The freshly painted part isintroduced into a drying chamber. Air is blown into the rectan-gular drying chamber at a volumetric flow rate of 60 m³/min, asshown in the figure below, which has dimensions L = 1.5 m,H=1.0 m, W= 1.5 m). The temperature of the air stream and thesteel body part are both maintained at 27°C, and the total systempressure is 1.0 atm. The molecular weight of the solvent is 78 g/gmole, the vapor pressure exerted by the solvent at 27°C is105 mm Hg, and the molecular diffusion coefficient of thesolvent vapor in air at 27°C and 1.0 atm is 0.097 cm²/s.Drying Chambergas distributorCA,00060 m³/min airH = 1.0 m27°C, 1.0 atm (W = 1.5 m)L = 1.5 mheated surface (27°C)paintedsteel platea. What is the Schmidt number and the average Sherwoodnumber (Sh₂) for the mass-transfer process?b. What is the estimated solvent evaporation rate from thesurface of the whole body part in units of g/min? It maybe assumed that convection mass-transfer limits the evapo-ration rate, and that the concentration of solvent vapor in thebulk gas is finite, but can be approximated as CA, ≈ 0.

Answered: Image /qna-images/answer/42402462-f746-460a-82bc-c602f04807f2.jpg

c. Using the results from part (a), how long will it take for the paint to completely dry? d. What are the hydrodynamic (8) and concentration boundary- layer (6) thicknesses at x=L=1.5 m? How does this compare to H, the height of the drying chamber? What is the new required air flow rate (m³/min) if the desired solvent mass-transfer rate is 150 g/min?

c. Using the results from part (a), how long will it take for the paint to completely dry? d. What are the hydrodynamic (8) and concentration boundary- layer (6) thicknesses at x=L=1.5 m? How does this compare to H, the height of the drying chamber? What is the new required air flow rate (m³/min) if the desired solvent mass-transfer rate is 150 g/min?

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter9: Heat Transfer With Phase Change

Section: Chapter Questions

Problem 9.28P

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