Fluid Mechanics Lesson 13A: Introduction to Boundary Layers

Fluid Mechanics Lesson Series - Lesson 13A: Introduction to Boundary Layers.

This video was recorded on Halloween; watch for a special guest appearance. In this 15.5-minute video, Professor Cimbala explains the concept of a boundary layer, and describes the boundary layer coordinate system used to analyze boundary layers. He then derives the boundary layer equations for steady, two-dimensional, incompressible flow and explains the significance of pressure remaining approximately constant through the boundary layer.

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:

[SHIELDSPACES]

Thank you for everything. Your lesson's are amazing.

[benjaminyellin]

At around the 7:10 mark in the video, you say that U/L and v/δ must balance and then conclude that they must be of the same order of magnitude. Why?
I understand that terms need to be dimensionally consistent, but U/L and v/δ can have the same dimensions without being the same order of magnitude, no?
(like, as an analogy: you can't add meters and seconds, but adding millimeters to meters is certainly okay, no? )

[norafatehi]

Sir have you authored a book in Fluid Mechanics alongside yunus A Cengel ?