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The entrance region was checked to ensure that the parabolic velocity profile was fully established. This was done by calculating the distance that it will take laminar flow to become fully developed, and make sure that this . This entrance region length is shorter than compared to the length of the tube settler. (Instead of saying what you're doing, show it. Give statistical meaning or values that reflect what you are seeking to do.), and if the ratio is less than one, then laminar flow is fully developed
The entrance regions are always less than the length of the plate settlers (Figure 7). Thus, based on this analysis, the best designs would include a plate settler with a larger spacing. fix the graphs here
Figure 7: Entrance Region vs. Plate Settler Spacing