Posted by Farant on Sunday, February 26, 2012 at 10:56am.
For transient situations with no heat generation and azimuthal symmetry, see the derivation of Eq. 2-28 at
http://wwwme.nchu.edu.tw/Enter/html/lab/lab516/Heat%20Transfer/chapter_2.pdf
In this case, T depends upon time (t) and r only.
There is a more complicated equation where there are variations with length z and aximutual angle phi.
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