[Tfug] Cooling

[Bexley Hall]

Greetings!

--- Ronald Sutherland <ronald.sutherland at gmail.com>
wrote:

> On Nov 24, 2007 11:05 AM, Bexley Hall
> <bexley401 at yahoo.com> wrote:
> 
> > But, what about devices that don't have these nice
> > identifiable hotspots?  Are there any rules as to
> > why or when it is best to pull vs. push air?  I
> > know the turbulence created by obstructions
> greatly
> > affects the cooling ability of the air flow.  But,
> > does the turbulence differ if the is air being
> > *pushed*
> > into that region vs. *pulled* though it?
>
> The fan will heat the air it moves
> The pulled air is more or less a Laminar flow (
> http://en.wikipedia.org/wiki/Laminar_flow)
> The pushed air is a Turbulent flow (
> http://en.wikipedia.org/wiki/Turbulent_flow)
> 
> My guess is turbulent air pulls heat off surfaces
> better. I think it mixes
> as it moves, while Laminar would have to conduct
> heat to the air not in contact with the surfaces.

Hmmm... your *guess* is as good as mine!  :<
I know, from discussions I have had over the
years with the folks who do this sort of thing
(few and far between) that it seems to be more
ART than SCIENCE.  :<

Thx!
--don


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