[Milsurplus] GRC109/R-1004A arrived!

[Gary Pewitt]

On 9/14/2011 1:05 PM, Mike Morrow wrote:
>> Every piece of solid state power equipment I have ever used
>> with a heat sink has it colored black.
>>      
> There are likely many more heat sinks in natural metal finish
> than there are painted (any color) sinks.  Heat sinks in air
> are **convective** heat dissipation devices whose color is
> completely irrelevant to the physical process.  Only in space
> or other vacuum-like ambient conditions will *radiative* heat
> transfer become significant.  And that requires very high
> temperatures.
>
> Big snip

When I worked at Lenkurt Microwave in San Carlos we went through 
extruded aluminum heat sink by the ton.  All of it was bare unpainted 
aluminum.
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-- 
Gary Pewitt   N9ZSV
1500 French Prairie Rd
Booneville, AR  72927