water in a 25-mm-diameter test tube evaporating into dry air at 1 atm. The distance from the water-air interface to the top of the tube is L=15 cm. The mass fraction of the water vapor at the water-air interface is 0.0235, and the binary diffusivity of water vapor in air is 2.6x10-5 m2/s. a) the mass evaporation rate of the water b)  the water vapor mass fraction at x=L/2. c) Plot the water vapor mass fraction from x = 0 to x=L d) the fraction of the water mass flow that is contributed by bulk flow and the fraction contributed by diffusion at x=L/2.

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
Section: Chapter Questions
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 water in a 25-mm-diameter test tube evaporating into dry air at 1 atm. The distance
from the water-air interface to the top of the tube is L=15 cm. The mass fraction of the water
vapor at the water-air interface is 0.0235, and the binary diffusivity of water vapor in air is
2.6x10-5 m2/s.
a) the mass evaporation rate of the water
b)  the water vapor mass fraction at x=L/2.
c) Plot the water vapor mass fraction from x = 0 to x=L
d) the fraction of the water mass flow that is contributed by bulk flow and the
fraction contributed by diffusion at x=L/2.
 
 
CH4
25°C, 1 atm
Air
25°C, 1 atm
To = 25°C
Combustion
chamber
CO₂
H₂O
25°C,
1 atm N₂
0₂
Transcribed Image Text:CH4 25°C, 1 atm Air 25°C, 1 atm To = 25°C Combustion chamber CO₂ H₂O 25°C, 1 atm N₂ 0₂
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