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The very clear spike in the data represents the point at which the floc particles began to roll up the tube settler, which was confirmed visually in the experimental apparatus. The velocity represents the critical velocity. At a certain velocity, the turbidity stabilizes, and stops increasing. This is because at a certain point, the number of flocs rolling up in the settler cannot increase anymore, therefore the turbidity cannot increase anymore. Given the current data that has been collected, we are not sure if this curve accurately represents how the turbidity should change during the ramp state function. (Compare this with your theory. Is this what you expected?) theory expects floc rollup to occur at 15.693 mL/min
Experiment 2: Ramp State Function with 15.3mm Tube Settler Diameter
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Unlike the results for the 9.5mm tube, there isn't a sharp increase in the turbidity. Although the turbidity of the effluent water increases, the increase in the turbidity is minimal compared to the 9.5 mm tube. Although the tubidity is slightly higher than our standard of 1 NTU, this is not a significant enough difference to assume that floc roll-up has occured. Thus, there is no clear evidence of floc roll up. (Why is this the case? Did theory predict that floc roll-up would occur? Can you speculate why this did not happen? Should you test at higher velocities?) theory expects floc rollup to occur at 65.557 mL/min