The Boundary Layer & Laminar Sublayer (sed strat) @sumnerd

Uploaded January 2009 | Updated September 2026, 2 weeks ago

In this video, I describe the boundary layer in a flow. The boundary layer is the zone where flow speed is reduced due to friction with the surface. At some point in the boundary layer, very close to the surface, the flow speed is so low that the flow becomes laminar. This is the laminar (or viscous) sublayer.

You can also see my lecture notes on this topic near the end of this blog post: dawnssedstrat.blogspot.com/2011/01/lecture-2-walthers-law-and-fluid-flow.html

The Boundary Layer & Laminar Sublayer (sed strat)

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