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Question

If the diameter of the pipe is given as D, what is the maximum thickness of the boundary layer?

A
0
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B
D2
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C
D
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D
2D
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Solution

The correct option is B D2
  • A pipe may be considered as a flat plate wrapped around to reform itself. Thus, fluid velocity starts at zero at the pipe wall and reaches a maximum value at the centre line of a straight pipe. It then return to zero velocity at the opposite wall of the pipe forming the velocity profile which is bullet shaped.
  • As the flow enters the pipe, the boundary layer thickness will increase parabolically starting from zero to d2(at centre).

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