Fred
How can you be sure the flow through the radiator is laminar? I have never
calculated the reynolds number, but I always assumed the number of
obstructions (thermostat bends ect) would cause a turbulent flow, or at
least would prevent a well developed laminar profile from developing. Maybe
it is just the fact that I deal with turbulent flow on an everyday basis so
I'm a little biased.
Please enlighten me!
Thanks
Ian
>From: "Fred Schroeder" <roadster2@texoma.net>
>Reply-To: "Fred Schroeder" <roadster2@texoma.net>
>To: "Leonard Sprague" <sprague@ufl.edu>, <datsun-roadsters@autox.team.net>
>Subject: Re: Aluminum Radiators
>Date: Mon, 21 Apr 2003 20:26:31 -0500
>
>Heat transfer is a strange world. The coolant has to travel fast enough so
>it doesn't boil at the point of pickup (block/head in this case). It also
>has to travel slow enough to transfer heat to the radiator. The following
>URL will give a crude idea of what I'm talking about.
>http://home.texoma.net/~sitsinwest/temp/flow.jpg
>
>Liquid travels fastest in the center of a pipe slowing as it approaches the
>wall of the pipe. It is possible to push the coolant through the center of
>the tube at a fast rate not giving it sufficient time to transfer the heat.
>This happens if the radiator is too small or the flow rate is too high.
>More tubes in a radiator will slow the coolant speed through each tube
>allowing more time to dump the heat. It is a balancing act that can get
>rather tricky to make work.
>
>If you are certain that you have proper flow rate for the engine, the only
>alternative is a larger radiator.
>
>Best regards,
>
>Fred Schroeder
>Denison, TX
>SRL311-13359
>TDROC
>Reg e-mail sitsinwest@texoma.net
>Home page http://home.texoma.net/~sitsinwest
>----- Original Message -----
>From: "Leonard Sprague" <sprague@ufl.edu>
>To: <datsun-roadsters@autox.team.net>
>Sent: Monday, April 21, 2003 7:05 PM
>Subject: RE: Aluminum Radiators
>
>
> > List,
> >
> > I'd like to thank Sid Raper, Brad Holms, Ian Miller, Andy Cost, Don
>Miller,
> > Milton, Craig Halsted, Greg Burrows, Michael Spreadbury, & Bill Hatfield
>for
> > replying to my inquiry about the radiator replacement. Thanks guys.
> >
> > I decided to replace the radiator for the VG30 engine with a 53mm thick
>-
>2
> > row - Koyo high-performance racing aluminum radiator.
> >
> > http://www.absoluteradiator.com/ProductPage.asp?idProd=11
> >
> > (it's the one on the top)
> >
> > I opted for this one because it was larger than the Fluidyne, which is
>38mm
> > thick.
> >
> > Guess what? It still gets hot!
> >
> > http://rabbit.circa.ufl.edu/gallery/vg30/DSC04793
> > http://rabbit.circa.ufl.edu/gallery/vg30/DSC04795
> > http://rabbit.circa.ufl.edu/gallery/vg30/DSC04797
> >
> > Anyone have any ideas?
> >
> > Currently, I running the 300z's water pump, the Koyo radiator, and an
> > electric fan. I'm wondering if the anti-freeze (or water) is running
>through
> > the radiator too fast to properly cool it. Would an electric pump work
> > better to slow the flow down? Or is there something else I can try? I'm
> > running out of time before Road Atlanta. Hopefully, I can figure out a
> > solution.
> >
> > Thanks in advance for any ideas or help. I really appreciate it!
> >
> > -Lenny Sprague
> > Gainesville, FL
> >
> > '69 SPL311/VG30
> > http://rabbit.circa.ufl.edu/gallery/roadster
>
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