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Tubing Pressure Drop Vs. Flow Rate Chart

post #1 of 10
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Edited by Martinm210 - 12/8/12 at 6:48pm
    
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post #2 of 10
Once again Martin!! well done.......
I should start calling you "Chart Martin" or "Martin Chart" or something like that lol, your always comeing up with these great charts yo help the visual people...(like me )
Thanks!!

I thought the same thing BTW, tubing is smooth and a bit extra wont make alot of difference since the whole loop is pressured.
Only thing i can think of that will effect with tubing is if you have it running out of your case into a rad outside your case, and making a "U" shaped bend.
Think that will cut some flow?

Anti-elbow campain!! Count me in!!!
All my tubing in there and didnt use 1 elbow!!
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post #3 of 10
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Quote:
Originally Posted by Apollo4g View Post
I thought the same thing BTW, tubing is smooth and a bit extra wont make alot of difference since the whole loop is pressured.
Only thing i can think of that will effect with tubing is if you have it running out of your case into a rad outside your case, and making a "U" shaped bend.
Think that will cut some flow?
LOL! I better stop with those charts then, I'm visual I guess. I'm one of those people that can fill up a 10page tech memo with one paragraph...more pictures and less BS works for me..hehe

As far as the loop bend, I think it's so insignificant that you can completely ignore it. Heck even with a 1/2" sharp elbow I only found that to be equivalent to 4' of tubing, while that seems like alot...4' of half inch tubing is only worth about .14psi pressure drop at 2 gal/min. If the flow is turbulent, that means all the water is mixing around as it flows through the tube, the only energy loss you have from a tubing bend is the very gradual change in direction but there is not restriction from the reduced ID of a fitting like an elbow, so I'd be willing to bet it's so small you couldn't even measure it unless it was so sharp that you start flattening the tubing.

I've also looked at several fitting loss charts and one comparison could be a standard 90 degree elbow vs a long radius 90 degree elbow. A long radius elbow is about 50% of the friction loss of a regular 90 degree elbow. That's enough for me to guess a tubing bend especially without the fitting loss where you reduce the ID to 3/8" is very small if even measureable. The next time I do a flow rate test I'll try to run a straight section then compare with a bunch of bends taped to the counter..I'm sure it's nothing.
    
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post #4 of 10
nice!
Hmmm so even with elbows it doesnt make that much difference.
Think i should of used them?
Although more elbows mean more fittings and more chance of leaks.

hey btw our builds are very similar
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post #5 of 10
Thread Starter 
Well not much difference compared to water blocks, but that's still 4' of tubing for every elbow and if you need two for one 180 degree bend that's 8 feet of tubing. And if you have four 180 degree bends you built with elbows..you just added another CPU block to your loop. I'd still much rather have bends than elbows, when I see elbows I think of a 1/4" kit system.





Also like you said, that's yet another chance for leaks..
    
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post #6 of 10
Pretty neat chart.....Here is a good calc. if you haven't seen it yet...

....Tubing Friction Loss Calc...
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post #7 of 10
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Quote:
Originally Posted by ira-k View Post
Pretty neat chart.....Here is a good calc. if you haven't seen it yet...

....Tubing Friction Loss Calc...
Thanks!
Oh...no I havn't great link...bookmark!
    
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post #8 of 10
Quote:
Originally Posted by Martinm210 View Post
Thanks!
Oh...no I havn't great link...bookmark!


.........
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post #9 of 10
I'm sorry to dig up this thread but the Pressure drop vs resistivity diagram was like a godsend to me.
Thank you very much Martin!

Looks like with the 13mm and 11mm ID tubing there is big difference compared to the smaller tubes.
My current setup is a Laing D5 that is on Level1 or Level2 (slow speed).
I have 2 EK GPU blocks and 2 radiators, I would say considering the components it is a low restriction system, so with my current tubing I can run pump at low speed fine.

I'm however considering Swapping my 13mm Barb fittings and 15.9/11mm tubing for som 13/10 compression and 13/10mm tubing, I'm however slightly worried about added tubing restriction the pump not being able to work any longer because of tubing tongue.gif

You can click this image for larger, as I said the blocks and rads are low restriction which enables the low speed on Pump.
th_IMG1371.jpg
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post #10 of 10
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Glad this old stuff is still of help...take it easy.thumb.gif
.Martin
    
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