Hi Joe and the gang. Me again...
Regarding the 9 times and Joe's statement that:
">>Friction loss in pipe is directly proportional to the length of pipe (the
>>additional bends would accounted for by adding equivalent lengths for them)
>>and is inversly proportional to the 4.87 power of the diameter."
That is only true for laminar flow and I would bet (hope) that we have
turbulent flow in our radiators. The presence of turbulant flow makes
things a little more complex. As to the 9x factor...who knows until you
measure it.
Brian
At 3:30 AM 8/31/98, Joe Hankins wrote:
>Bob,
>
>Just curious, but where does the 9 times flow resistance come from?
>
>Friction loss in pipe is directly proportional to the length of pipe (the
>additional bends would accounted for by adding equivalent lengths for them)
>and is inversly proportional to the 4.87 power of the diameter.
>
>Joe
>
>-----Original Message-----
>>From: Bob Palmer <rpalmer@ames.ucsd.edu>
>To: Armand & Lorie Ritchie <ritchie@mcn.org>; tigers@autox.team.net
><tigers@autox.team.net>
>Date: Sunday, August 30, 1998 2:57 PM
>Subject: Re: u s radiators
>
>
>>Armand, Lorie, et Listers,
>>
>>I couldn't access this site, but with regard to a triple-pass radiator,
>>this is certainly not a new concept. I first saw this type of radiator in
>>the mid '70s, and they probably weren't new even then. I have never heard
>>an explanation I believed about why double or triple pass would be better.
>>I had a long conversation with Ron Davis (aluminum racing radiator builder)
>>about the multiple pass concept and he believes that two is better than
>>one, but three is too much. This I am sure of, a three pass radiator has
>>NINE TIMES ( that's 9X) the flow resistance of a single pass radiator. If
>>you try using a garden hose to run water through a three-pass, you'll
>>quickly see what I mean. I ended up getting a three-pass from Ron, but am
>>not convinced I did the right thing; would have preferred a two-pass, but
>>that leaves the outlet and inlet on the same side so it requires some
>>modifications to the hoses and water pump. At the very least, a three-pass
>>needs a good water pump that will provide enough pressure to ensure good
>>flow, especially at low rpms. I got my water pump from Sunbeam Specialties
>>and it seems to do a good job. In fact, I drilled a 1/8" hole in the
>>thermostat and even this small hole allows enough flow to keep it running
>>well below the thermostat regulation temp (195 F) most of the time.
>>
>>Bob
>>
>>At 10:35 AM 8/30/98 +0100, Armand & Lorie Ritchie wrote:
>>>Hi all I just checked out a neat web site (www.usradiators.com) they have
>a
>>>novel concept of radiator design. Triple flow which they claim is the
>most
>>>efficient. the radiator is made with three separate chambers that the
>>>coolant must travel through. They do customs and hotrods also sports
>cars.
>>>You can submit a drawing and they will give you a quote on price.
>>>Interesting site.
>>>regards Armand Ritchie
>>>
>>>ritchie@mcn.org
>>>Armand & Lorie Ritchie
>>>
>>Robert L. Palmer
>>Dept. of AMES, Univ. of Calif., San Diego
>>rpalmer@ames.ucsd.edu
>>rpalmer@cts.com
>>
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