1
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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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