This preview shows page 1. Sign up to view the full content.
Chapter 4
Transient Heat Conduction
Transient Heat Conduction in Large Plane Walls, Long Cylinders, and Spheres
426C
A cylinder whose diameter is small relative to its length can be treated as an infinitely long cylinder.
When the diameter and length of the cylinder are comparable, it is not proper to treat the cylinder as being
infinitely long. It is also not proper to use this model when finding the temperatures near the bottom or top
surfaces of a cylinder since heat transfer at those locations can be twodimensional.
427C
Yes. A plane wall whose one side is insulated is equivalent to a plane wall that is twice as thick and
is exposed to convection from both sides. The midplane in the latter case will behave like an insulated
surface because of thermal symmetry.
428C
The solution for determination of the onedimensional transient temperature distribution involves
many variables that make the graphical representation of the results impractical. In order to reduce the
number of parameters, some variables are grouped into dimensionless quantities.
This is the end of the preview. Sign up
to
access the rest of the document.
 Fall '10
 Dr.DanielArenas
 Thermodynamics, Mass, Heat

Click to edit the document details