Heat Transfer
Heat transfer lectures by Professor Josua Meyer (2014). Topics covered in the lectures include: transient or unsteady heat conduction, convection heat transfer, external and internal forced convection, heat exchangers, thermal radiation including atmospheric and solar radiation. The lectures are based on the textbooks of White (8th ed) and Cengel and Ghajar (4th ed) and were presented as part of a heat transfer class to the fourth year students of the Department of Mechanical and Aeronautical Engineering, University of Pretoria.
| Lecture 09 - Transient Heat Transfer: Plane Walls, Cylinders and Spheres |
This lecture continues with unsteady/transient heat conduction, specifically in large plane walls, long cylinders and spheres. After the exact equation for one dimensional heat transfer was derived in previous lecture an example is done. The example is a continuation of the previous lecture about a beef carcass (Problem 4.59 in the book of Cengel and Ghajar) and to determine how long it will take for the center to reach a certain temperature during refrigeration conditions and if any part of the carcass will freeze during the process. Also the heat transfer and heat transfer rates are determined.
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