Fluid Mechanics Lesson Series Lesson 15C: Compressible Flow in ConvergingDiverging Ducts.

In this 16.5minute video, Professor Cimbala examines compressible flow through a convergingdiverging (CD) duct, showing that there must be a throat (minimum area) in order for supersonic flow to exist in the duct. He then derives the area ratio vs. Mach number relationship for steady, adiabatic, isentropic, onedimensional flow in a duct, and shows how to solve for Mach number at a given area ratio. He also discusses what happens in a CD duct as back pressure varies. Finally, he does some example problems.

This video incorporates material from Sections 123 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