Re: [ATM] Thermal mirror deformation -fan on both sides

[Ric Rokosz <radicell2@yahoo.com>]

--- tony gondola <acgna@comcast.net> wrote:

> I don't think it's a matter of how important the
> work is but is it a useful, 
> validated tool? It's interesting but I don't think
> anyone really knows what 
> to do with it. Everyone knows that performance will
> be degraded while the 
> mirror is equalizing to ambient. My personal feeling
> is that actual field 
> measurements would be more useful.

Perhaps you need to tell the pro's that,as it has been
noted on the list over the years that from their
studies blowing air across the front face and back
does allow faster cool down .

> 
> I'm also not sure that I agree with conclusion on
> fan placement. The most 
> common configuration is to blow air out from the
> back of the tube or mirror 
> box. The fan isn't blowing directly on to the glass
> but is rather setting up 
> a flow of air that surrounds the mirror, front back
> and sides.

Funny how once the idea of even having a fan of any
type -blowing or sucking,was a very alien notion.



> The actual 
> airflow is much more complicated then Jan's simple
> infinite diameter disk 
> model suggests and is also subject to turbulence and
> dead areas induced by 
> various structures in the flow path including the
> mirror's edge. Even a full 
> CFD analysis wouldn't tell the whole story.

Give us a break here,we're talking about the thermal
mass of the glass and how to cool it,with low flow
fans over atm constructed cells,not the dynamics of
Mach 2 airfoils!

Ric

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