ChE 4131: Transfer Science III, Mass Transport
Dr. H. A. Stretz
HW 1
Due Thursday Sept. 1
1. State in words the difference between a mass transfer coefficient and a diffusion coefficient.
2. Attach a plot of the mole fraction (concentration profile) of species 1 (range of 0 to 1) versus
relative position up the capillary, z/l. This graph MUST have labels on the axes and a figure
caption. The problem was described in class and the relevant figure in the book is Fig. 3.3-1.
3. Why is this function not linear as described by Fick’s Law?
4. Where is the mole fraction of species 1 at its highest?
5. Intuitively species 2 is a stagnant gas (no dynamic movement) and might have the same mole
fraction no matter what position up the capillary. Is this true? State a simple equation that
would allow you to plot the concentration profile of species 2 given the concentration profile of
species 1.
6. Calculate the rate of evaporation (grams/hour) of a chloropicrin gas into air at 25oC. Treat air as
a pure substance. Draw and label the capillary setup applied to this problem from Figure 3.3-1.
Show all your work with units and starting with the relevant differential equation derived in
class. Show all assumptions. Note that the rate of evaporation for such a device would be equal
to the flux of species 1 at the top of the capillary.
PTOT 770 mm Hg
D1,2
0.088 cm2/sec
Pvap,1
23.81 mm Hg
L 11.14 cm
Density1 1.65 g/cm3
Area
2.29 cm2
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