Stu,
THANK YOU!!
BTW, a few months back one of Steve's engineer friends and I had an e-mail
discussion of this subject and figured that it would be a swell idea to add
dimples to the radiator tubes to induce turbulence. Just one of those
armchair engineering sessions. Without anything but smooth walls, the flow
velocity is way below the flow velocity (Reynolds number) needed for
turbulence.
Next time this subject comes up, you're the designated engineer on call. ;-)
Bob
At 01:17 PM 1/21/00 -0500, BRENNAN,STUART (A-Andover,ex1) wrote:
>I think the deal here is to make the flow within the tubes turbulent, so
>that all of the fluid gets to be right next to the wall at some point. This
>gets back to the laws about heat transfer being proportional to the
>temperature difference across the interface. If the fluid along the sides
>of the tubes cools, but the fluid in the center is warmer, then stirring
>things up will get this warmer fluid out to the sides of the tube, raising
>the temperature across the interface, therefore transferring more heat. How
>much of a difference does this make? I'm just guessing, but it must be
>measurable ( a couple percent maybe?) or they wouldn't exist. How
>"unturbulent" is the flow in a normal radiator tube? Any "ME's" out there?
>
>Stu
Robert L. Palmer
UCSD, Dept. of AMES
619-822-1037 (o)
760-599-9927 (h)
rpalmer@ucsd.edu
rpalmer@cts.com
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