Re: heat sink cooling

[Colin Dedman <cjd121@rsphy1.anu.edu.au>]

>
> >Take 3 equally sized heat sinks , bare alum, one black and one white, put a
> >50 ohm resistor on each and apply 12 volts. The bare aluminum heat sink will
> >have the lowest thermocouple reading disproving the "black body radiator"
> >theory. A black surface only helps when absorbing heat from the sun.
>
> I have done the above many times.  In still air black anodizing is
> noticably better.  Polished aluminum is the worst.

Thanks Ron. Looks like we won't need to rip up our Physics text books, just yet.

Regards, Colin