Railways Technical Ability Fluid Mechanics and Machinery Question Bank Fluid Mechanics

  • question_answer The thickness of laminar boundary layer at a distance 'X' from the leading edge over a flat plate varies as:

    A) \[X\]                             

    B) \[{{X}^{1/2}}\]

    C) \[{{X}^{1/5}}\]                                   

    D) \[{{X}^{4/5}}\]

    Correct Answer: B

    Solution :

    Thickness of laminar boundary layer over a flat plate, \[\delta =\frac{5x}{\sqrt{{{\operatorname{Re}}_{x}}}}=\frac{5x}{\sqrt{\frac{vx}{v}}}\propto {{x}^{1/2}}\]

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