[Tfug] Cooling

[Ronald Sutherland]

On Nov 26, 2007 12:12 AM, Ronald Sutherland <ronald.sutherland at gmail.com>
wrote:

>
>
> On Nov 24, 2007 11:05 AM, Bexley Hall <bexley401 at yahoo.com> wrote:
>
> > Hi,
> >
> > 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.
>
> Opps, I was just putting thoughts together, then I hit send... :(