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ENV 6015
Diffusion Problem Set
1.
Salt water containing 11700 mg/l of NaCl (0.2 mole per liter) lies beneath a onefoot lens of
fresh water, which is essentially, salt free to begin with.
Find the concentration of NaCl in
the lens after 30 days contact.
Assume a constant temperature of 15
o
C.
2.
The initial dissolved oxygen concentration of an acquiescent body of water 1foot deep is 5.0
mg/L.
Assume the rate of absorption of oxygen from the atmosphere is sufficiently fast to
saturate the surface layer of the water in a relatively short period.
Find the concentration
after one week if the temperature of water remained constant at 15
o
C.
3.
Sucrose solution to 20
o
C has a viscosity n
3
= 1.01 x 10
2
gm cm
1
sec
1
.
If the density of
sucrose is 1.59 gm/cm
3
and diffusivity D
1
= 0.36 cm
2
/day determine the molar concentration
of the solution.
Also, determine the molecular diameter.
4.
An experimental channel of 200 ft. long 2.5 ft. wide and 2 ft. deep was used for dye studies.
The water depth in the flume was 1.0 ft and the stream flow was kept constant at a rate of
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This note was uploaded on 01/14/2012 for the course ENV 6015 taught by Professor Taylor during the Fall '11 term at University of Central Florida.
 Fall '11
 TAYLOR

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