Mani, <For a coppermine, copper fins are virtually useless.>
That's why Intel demonstrated their first Giga-Cumines
with all-copper convoluted-fin heat sink, right?
<If you put in 0.1 W power in the sink with free convection, then copper won't even help 0.01%. If you put in 1000 W and have liquid forced cooling then..>
We are not talking here about free convective sinks nor
about 1kW liquid cooling. Extreme cases do not stress
your point. Please use relevant scales
of matter - 40-50W and forced air.
<For a typical sink and a fan, and power of around 30 watts, copper fins add virtually zero.>
And for the same relevant range, this experimental
study, with described methodology and data, obviously
disagree with your unsupported statement, see again:
rtcgroup.com
<For a copper pin fin to provide a meaningful advantage over a power ranges of a typical CPU, the aspect ratio (length/width) of the fin needs to be very high, almost un practical.>
You see the picture in reverse: the aspect ratio does not
_need_ to be very high, but it _can be_ very high. Which
means that the air gaps can be made bigger for the
same effective surface, which means
that the resistance to air flow can be smaller, which
means that the same fan can provide more air flow,
which means that the sink surface temperature can be
lower, which means lower overall thermal resistance.
And about being un-practical, people have invented
fins made of copper shim. Sinks are light, and have very
efficient fin "aspect ratio". For typical convoluted
fin design, see:
wakefield.com
Regards,
- Ali |
