
132 Heat Transfer: Thermal Management of Electronics
Total heat transfer rate from this n is equal to conduction heat transfer rate to its
base and is calculated by Fourier’s law of heat conduction:
QkA
dT
dx
TT hPkA
fc
x
bc
=− =−
=0
() .
∞
(7.16)
7.1. 2 aD i a B a T i c Fi n Ti p
The combined convection and radiation heat transfer rates from a n is proportional
to its surface area. The surface area of the tip of a n is usually a small fraction of
the total surface area of that n. Therefore, the heat transfer rate from the tip of a
n may be neglected compared to the heat transfer rate from the rest of the n. The
adiabatic n tip, which assumes ...