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Consider laminar flow of water over a flat plate of length 1 m. If the boundary layer thickness at a distance of 0.25 m from the leading edge of the plate is 8 mm, the boundary layer thickness (in mm), at a distance of 0.75 m, is

1. 8
2. 12
3. 14
4. 24

Correct answer: 14

Solution

The boundary layer thickness in laminar flow over a flat plate increases with the square root of the distance from the leading edge. Given that the thickness at 0.25 m is 8 mm, we can use the relationship to find that at 0.75 m, the thickness increases to approximately 14 mm.

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