[Amps] making aluminum heat sinks black

[Peter Chadwick]

Dennis said:
>Then raise the pan with one side facing your
cheek... take note of the radiant heat you feel from the bottom side
vs. the dark teflon side.  Dramatic to say the least.  Almost none is
felt from the bottom, the dark side radiates a great deal of heat.
  Yet, many radio heat sinks are bare aluminum.. go figure.<
Transmitter heat sinks don't get that hot. Radiation follows Stefan's law - sigma times temperature to the fourth power. So raising the temperature a long way does have it make a difference over convection, but raising the temperature  a few degrees doesn't.

73
Peter G3RZP