Railways Technical Ability Fluid Mechanics and Machinery Question Bank Fluid Mechanics

  • question_answer The square root of the ratio of inertia force to gravity force is called:

    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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