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One 1/2" Elbow = 4' of 1/2" ID Tubing (Test Results) - Page 3

post #21 of 28
Question: How much does tubing bends affect flowrate?

Like you said, using more tubing is better than using an elbow. However, will using 2' tubing with a sharp bend be worse? Thanks for the research!

(If you want, I can loan you my spare DD Elbow with fittings)
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post #22 of 28
Thread Starter 
Tubing bend losses are very small, small enough that that for everything I've seen hydraulics related it's completely ignored in most practices. I don't think it amounts to anything unless you start collapsing the tubing section, and that's where cool sleeves come in well.

As far as how much flow rate will drop is dependant on the pump head capability, a petra topped MCP355 probably isn't going to have much trouble with a few restrictions and while an elbow may be worth 4' of tubing I should do the same test for a water block and radiator...it would be much more than that.

The only thing with elbows and my general suggestion is to avoid them when possible, but a couple of them are not going to completely change the performance of a system, it's just that an extra foot of tubing is still much better than an elbow.

I'm a bit tight on cash through this month so I'm not sure when I'll get around to more tests just yet, but I appreciate the offer. I'd like to get another loop to put in for the chipsets before I tear everything down again.
    
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post #23 of 28
Thread Starter 
Add pressure drop curves and some examples of how flow rate will be affected in the OP:

http://www.overclock.net/2270665-post1.html

Elbow away.....within reason
    
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post #24 of 28
Great guide

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post #25 of 28
Thread Starter 
Quote:
Originally Posted by DuckieHo View Post
Question: How much does tubing bends affect flowrate?

Like you said, using more tubing is better than using an elbow. However, will using 2' tubing with a sharp bend be worse? Thanks for the research!

(If you want, I can loan you my spare DD Elbow with fittings)
Sorry, I just realized I missed your post. I don't think tubing bends affect flow much at all, but I havn't tested it. I think because the water is in a turbulent state that it's mixing and hitting the walls of the tubing over and over as it moves along anyway, so a gradual change in direction isn't going to add up to any measureable amount.

And if you're interested in the DD elbow results I can do that too. My guess is that it's going to be worse than a regular elbow because of the interior steps, but we won't know until it's tested. Sure, throw it in there, that would be cool to find out.
    
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post #26 of 28
Sorry to revive a 2 1/2 year dead thread, but DuckieHo's question is sticking in my mind, because in order for my current loop to work the way I need it to, I'll be looking at using ATLEAST 2 elbows.

Has anyone done any testing since Martin's nice work?

I'll spend the money on the DD fittings like DuckieHo had asked ages ago if they're going to not reduce my flow considerably.

Edit: 700th post too, woooo
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post #27 of 28
depends on what kind of elbows you are going to use and what pump you have?

if you have DDC3.2, it won't be as big of a deal because of the DDC3.2's higher head. and it also depends on if you're using a straight 90 or if you are using say 2x45s...

i did do a bit of testing on them and the hit on flow was pretty big in my eyes.. i'd have to find the thread/post again.. but if you need to use them then use them. overall, it shouldn't really matter regardless between D5 and DDC3.2 pumps. it would only really matter if you're a huge flow freak.
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post #28 of 28
Try using something LIKE THIS. It should be much less restrictive than a 90 degree elbow...
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