Question: Some students want to visualize flow over a spinning baseball. Their fluids laboratory has a nice water tunnel into which they can inject multicolored dye

Some students want to visualize flow over a spinning baseball. Their fluids laboratory has a nice water tunnel into which they can inject multicolored dye streaklines, so they decided to test a spinning baseball in the water tunnel

(

Fig

. 2) .

Similarity requires that they match both the Reynolds number and the Strouhal number between their model test and the actual baseball that moves through the air at

65 m \frac{i}{h}

and spins at

200

rpm

.

Both the air and the water are at

15 C .

At what speed should they run the water in the water tunnel, and at what rpm should they spin their baseball?

Some students want to visualize flow over a

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