Re: Heatsinks for real.

[Grant Wallace <grantwal@bellsouth.net>]

You want just a little back pressure on the passages, this will force s
the flow rates of the individual passages to equalize, giving even
cooling across the heat sink.

Remember the sum of the cross section of the passages should be a little
less than the inlet AREA. If the you use a fitting you must consider the
opening in the fitting not the hole the fitting screws into.

SteveB48@aol.com wrote:
> 
> Can you do the same thing by using 4 3/16" passages which are connected by 3/8" inlet and outlet? If I did the math right 4 3/16" holes are actually a little larger than 1 3/8" hole. Would it be better to use, for example, 3/8" everywhere except for the connection between each of the 4 tubes to the outlet side where you would have a 3/16" passage?
> 
> Steve
> 
> In a message dated Tue, 27 Feb 2001  6:48:24 PM Eastern Standard Time, Grant Wallace <grantwal@bellsouth.net> writes:
> 
> <<
> 
> Andre Blanchard wrote:
> >
> > You could put a small restriction (like a small bushing) in each of the
> > channels that you what to share the flow.  It works just like using
> > resistors to force multiple transistors to share current.  It should not
> > take much of a restriction to make it work.
> >
> The restriction should be slightly less than the cross sectional area of
> the inlet divided by the number of passages you wish to divide the flow
> into. I say slightly less because you need a little back pressure will
> compensate for uneven drag in one or more of the passages.
> 
> > Andre' B.  andre_54005@yahoo.com
> > If something cannot be defined, it does not exist.
> > Isaac Newton
> >
> > >My current water path doesn't work too well, it tends to flow through the
> > >closest channel.  After reading your comments I'm going to change the flow
> > >in my heatsink to two U-shaped paths with the inlets on the inner channels.
> > >
> > >Ralph
> >
> > _________________________________________________________
> > Do You Yahoo!?
> > Get your free @yahoo.com address at http://mail.yahoo.com
> 
> --
> Grant Wallace
> Hixson, TN (Chattanooga suburb)
> 
> TANSTAFL- There ain't no such thing as a free lunch.
> BOHICA- Bend over, here it comes again.
> When in danger, or in doubt, run in circles, scream and shout.
> 
>  >>

-- 
Grant Wallace
Hixson, TN (Chattanooga suburb)

TANSTAFL- There ain't no such thing as a free lunch.
BOHICA- Bend over, here it comes again.
When in danger, or in doubt, run in circles, scream and shout.