Fluid Mechanics Lesson 13C: Boundary Layer Displacement Thickness

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
www.me.psu.edu... .
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Dr. John M. Cimbala is Professor of Mechanical Engineering at Penn State. He is an educator, textbook author, Christian author, husband, father, and grandfather. He also created and maintains a website for helping people grow in their faith called Christian Faith Grower at www.christianf... His KZbin channel is at / @johncimbala

[@thomas_hall]

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*.

[@johncimbala]

You are correct but I ignored the corner effects since delta* is so small compared to W or H, so it is insignificant.

[@thomas_hall]

@@johncimbala Noted. Also, I thank you sincerely for this well crafted video series. An unbelievably helpful exam-prep resource.

[@johncimbala]

@@thomas_hall Thank you. I appreciate your comments.