A) Reynolds number
B) Froude number
C) Mach number
D) Euler number
Correct Answer: A
Solution :
\[\frac{\delta }{x}=\frac{0.37}{{{({{\operatorname{Re}}_{x}})}^{1/5}}}=\frac{0.37}{{{\left( \frac{{{U}_{x}}}{v} \right)}^{1/5}}}\propto {{x}^{-1/5}}\,\,or\,\,\delta \propto {{x}^{4/5}}\]
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