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#1)Wall Friction: We can attribute the increase in error as flow rate increased due to the increase in wall friction on the test vial. We can minimize this by increasing the size of our bench scale experiments.
#2) Sand Properties Parameters: We might have used an incorrect D60 and porosity for the filter bed in our equations. We tested this in our Mathcad code and found that if we increased the porosity from 0.4 to 0.5, the graph changed to Figure 3:
Figure 3: Fluidization Velocity Experiment-porosity change
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