Fluid Mechanics Lesson 15B: Compressible Flow and Choking in Converging Ducts
Fluid Mechanics Lesson Series - Lesson 15B: Compressible Flow and Choking in Converging Ducts.
In this 14-minute video, Professor Cimbala examines compressible flow from a pressurized tank into a converging duct. He explains why this flow cannot go supersonic, but must remain subsonic throughout the duct. He shows that the only place where the flow can be sonic is at the exit plane of the duct. He then defines equations for critical conditions, which is another way of saying sonic conditions. He describes how flow through a duct chokes when the back pressure is low enough. Finally, he derives the equation for mass flow rate through the duct and does an example problem.
This video incorporates material from Sections 12-2 and 12-3 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
https://www.me.psu.edu/cimbala/Cengel... .
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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 https://www.christianfaithgrower.com/ His YouTube channel is at / @johncimbala
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