Re: ATM Cooling fans - blow sideways like the pro's

[Anthony Stillman <atmer@flash.net>]

>...two fans...the flow should be largely laminar.
>
>This would then go
>
>                                              fan
>filter  fan                                 _____________
>------------\                              /    \
>  ##     \   \                          ---     \
>  ##     >      ______________________           >
>  ##     \   /  Mirror, starry side up  ___     \
>------------/   ______________________     \____\________
>
>



Ian, others,

I haven't been following this thread and the other related ones carefully
so if this has already been noted, please forgive.

>From my copy of "Cooling Techniques for Electronic Equipment" Steinberg
Copywrite 1980 John Wiley and Sons, Inc. chapter 6 page 164 paragraph 5;

"Laminar flow conditions as well as turbulent flow conditions can exist
with forced convection in liquids and air.  Turbulent flow conditions are
much more desirable, because they permit more heat to be removed.  However,
turbulent flow will usually result in a higher pressure drop through the
system, which requires that larger pumps and fans and more power be used to
overcome the added resistance."

Incidently, I highly recommend the above noted book, still.  It is filled
with lots of examples and copes well with the myriad of units common to
problems involving heat.

Anthony