On Thu, 5 Oct 2006 02:07:38 -0700, "Timothy Daniels"
<TDaniels@NoSpamDot.com> wrote:

>Some people believe religiously in smooth laminar flow
>of fluid past an object to cool that object.

Oh?

Who?

I believe in reducing turbulence PRIOR to the part, and
AFTER the part. The part itself when properly designed, has
sufficient 'sinking for this and the system designer needs
only sufficient airflow rate.


> But turbulence
>actually acts to scrub away the boundary layer of air (or
>other fluid) that surrounds the object to make closer contact
>between the object and the passing fluid. It is the blind
>belief of many with non-technical educations that flow should
>be laminar (i.e. "smooth") because fluid flows fastest and
>unimpeded by the drag that turbulent flow suffers. But it is
>the very nature of the contact between the flowing fluid and
>an object that causes both the drag and the transfer of heat.
>In other words, drag goes hand in hand with heat transfer,
>and drag against a surface to be cooled is a measure of
>the success one will have in cooling that surface.

You again demonstrate that you read something, didn't test
it, and want to, but can't, apply it to your proposed
environment and cooling needs of typical parts.


Pity that Tim doesn't understand that if any of these parts
needed some extra thought on his part, it would be
mentioned, and people not taking this half-baked concept and
employing it would have overheating parts- which they do
not.

As suggested previously, the next time you read of someone
with a part overheating, suggest to them that they not try
to increase airflow, rather leaving chassis airflow alone
and only increasing turbulence prior to that hot part.

Show us even one example of someone who found relief, a cool
temp resultant from doing this. Did you think turbulence
was a SECRET? Apparently so, otherwise there would surely
be at least one example of a computer part overheating that
was brought down in temp by implementation of your
incomplete idea.

You have no evidence Tim, only a limited grasp of one
variable opposing another 3 important variables:

1) Air temp
2) Flow rate
3) Fan noise

Until you address all three and TEST THIS, you're wasting
your time.