Question

How do you find the boundary layer thickness of a pipe?

Answer 1

The boundary layer thickness is usually defined as the distance from the wall to the point where the flow velocity reaches 99 % of the free stream value.

In the very thin boundary layer associated with free stream flows with high Reynolds numbers, a steep rise in velocity occurs perpendicular to the wall.

Boundary layer thickness = 0.37*Distance on x-axis/(Reynolds Number^(1/5))

δ = 0.37*x/(Re^(1/5))

This formula uses 3 Variables:

Variables Used

Boundary layer thickness - (Measured in Meter) - Boundary layer thickness is the distance normal to the wall to a point where the flow velocity has essentially reached the 'asymptotic' velocity.

Distance on x-axis - (Measured in Meter) - Distance on x-axis is the distance of point measured along x-axis form origin.

Reynolds Number - The Reynolds number is the ratio of inertial forces to viscous forces within a fluid which is subjected to relative internal movement due to different fluid velocities. A region where these forces change behavior is known as a boundary layer, such as the bounding surface in the interior of a pipe.

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