
244 Heat Transfer: Thermal Management of Electronics
can be used to obtain convection heat transfer coefcient for gas ow across
noncircular cylinders [3].
10.6 CYLINDRICAL PIN-FIN HEAT SINK
Many engineering applications include uid ow across a series of cylinders.
Examples are airow through the coil of a car radiator, water ow across the tubes
of a shell-and-tube heat exchanger, and air or liquid ow across ns of a pin-n heat
sink or cold plate. There are many empirical correlations for convection heat transfer
coefcient and drag coefcient in these ows [3 and 5]. These correlations will not
be presented here. Instead, ...