Fluid Mechanics Lesson 13C: Boundary Layer Displacement Thickness

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Fluid Mechanics Lesson Series - Lesson 13C: Boundary Layer Displacement Thickness.

In this 12-minute video, Professor Cimbala defines the laminar boundary layer displacement thickness and discusses its effect on fluid flows. He shows a very practical example in which displacement thickness is used in the design of a wind tunnel test section. He also briefly discusses momentum thickness which is similar to displacement thickness except in terms of linear momentum rather than mass flow.

This video incorporates material from Section 10-6 of the Fluid Mechanics textbook by Cengel and Cimbala, Edition 4.

An Excel file listing of all the videos in this series, along with the annotated notes generated during filming of the videos, can be found at


You can also watch all related short videos with one click by going to one of Dr. Cimbala's playlists:

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Hi Prof.
In your calculation for the effective cross sectional area, I believe you accounted twice for the corner areas when subtracting from the initial area. I get WHo - 2Wd* - 2(Ho-2d*)d*.

thomas_hall