PPT Slide

Boundary Layer Concept

Immediately adjacent to a solid surface, the fluid particles are slowed

by the strong shear force between the fluid particles and the surface.

This relatively slower moving layer of fluid is called a “boundary layer”.

Laminar

Turbulent

Question: which profile has larger wall shear stress?

In other words, which profile produces more frictional

drag against the motion of the solid surface?

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