DISCUSSION OF RESULTS
In this experiment, there were four different packing materials: sand, glass beads,
rashing rings and berl saddles. The first five runs using the sand bed, the flow rate was
between 3.79*10
6
and 1.64*10
5
m
3
/s. And as the flow rate increased, the pressure drop
increased from 1549.98 to 8220.78 Pa. A direct relationship was observed between
the flowrate and ∆P/L. The friction factor decreased while the Reynold’s number
increased. The error from the theoretical values varied from run to run. The same
applies for the other beds as shown in the tables.
The value of the shape factor was also obtained to be 1.0 for sand and glass, 0.197
for the rashing rings and 0.69 for the berl saddles. The following relations were
obtained from the plots of f
p
vs. 1/Re:
For Sand
f
p
= 170.77/Re + 2.0872
For Glass
f
p
= 156.3/Re + 2.0686
For Rashing Rings
f
p
= 1104.6/Re – 1.3147
By comparing these equations from the graph with Ergun equation, I found these
equations are close to the Ergun equation except for the Rashing Rings. Also, I
noticed that the slope of the graph of the glass beads is negative value due to some
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 Fall '09
 M.Elgaily
 Chemistry, Fluid Dynamics, Causality, Rashing Rings, berl saddles

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