• question_answer The square root of the ratio of inertia force to gravity force is called: A) Reynolds number           B) Froude numberC) Mach number    D) Euler number

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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