In Figure 4-34 the drag coefficient CD drops significantly at a Reynolds number of about 4 x 10^5. What is the explanation for this?
What will be an ideal response?
At a Reynolds number of around 4 x 105 for fluid flowing around a cylinder, the
fluid separates from the cylinder slightly past the equatorial belt and a wake or
back flow results, thus creating a lower drag force and therefore a lower drag
coefficient.
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