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Old September 26, 2007, 05:30 AM
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Default flow restriction on 90 deg fitting?

I'm considering putting a couple of these into my loop Danger Den Delrin Machined 90 Degree Fitting with No Fittings G1/4 .

Is that going to be an issue with regards to creating a flow restrictions, and/or would I be just as well off to put a 90 deg plastic fitting in place?
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Old September 26, 2007, 07:03 AM
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Ok. this is text book material in Fluid Dynamics, Fluid Power, and/or basic Hydraulics.

What your looking at is a difference in "Turbulent" and "Laminar(also known as Laminet)" flow. Pretty simple really. Turbulent is rough flow such as putting your thumb over a hose and forcing a pressure buildup or even a fast moving river over rocks and hilly areas. Laminar flow is smooth going. No rough turns, no orifices for it to pass through.

No if you have a system under high pressure it's a good idea to keep as much laminar flow as you can, even though it can handle just about all the turbulent flow you can throw at it.

Given this is not a high pressure system but the basic idea should be understood.

If I would suggest... put AS LITTLE 90 elbows as you can. Your pump will be forced to push harder. Granted the pump won't be working so hard you have to worry about it not working, she will still pump nicely. I would be more worried with the life of your pump. You could actually cause your pump to loose a fair chunk of it's life, could be small but it's not really worth a risk.

Use some wire, coil, or even zip ties to make ribs on the tubing. the flow is much more consistent and will transfer the heat much more fluently.

I'll admit I did use one 90 elbow on my old system, only because I screwed up and had no choice. so my recommendation is to avoid the elbows.

Oh, and Home Depot has the elbows, t-fitting, etc for MUCH cheaper.

Hope that helps
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Old September 26, 2007, 12:35 PM
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Here's a link with some good information regarding 90 degree elbows.

King of the Elbows, Copper goodness - XtremeSystems Forums
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Old September 26, 2007, 01:33 PM
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Hmmmmm...... so at the very least, go with a standard plumbing copper 90 deg angle........

Might need to rethink my original plan for the new build. There is nothing stopping me from going down through the top plexi like I did with the holes in the aluminum case top for my original build........
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Old September 26, 2007, 01:36 PM
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Default i dont like them

Ive only worked with water in designing experimental setups in marine labs. I remember using a 90 degree attachments for a series of tanks and it often introduce airlocks. Although you have more of a closed system here. I would have thought it better to go curved. Maybe aquaculture suppliers will have what you want at a better price.
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Old September 26, 2007, 01:49 PM
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Quote:
Originally Posted by magictorch View Post
Ive only worked with water in designing experimental setups in marine labs. I remember using a 90 degree attachments for a series of tanks and it often introduce airlocks. Although you have more of a closed system here. I would have thought it better to go curved. Maybe aquaculture suppliers will have what you want at a better price.
Yeah, I'll have to look around, but I'm really starting to think that coming straight down the rear and into the case isn't the way I'm going to go..... :)

Barring that, I may do some experimenting with elongated entrance holes which would allow me to come into the case at a 45 deg angle rather than looping around to a 90 deg entrance angle.
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Old September 26, 2007, 02:12 PM
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Quote:
Originally Posted by sswilson View Post
Barring that, I may do some experimenting with elongated entrance holes which would allow me to come into the case at a 45 deg angle rather than looping around to a 90 deg entrance angle.
Good idea, you'll need some grommets (also called caterpillars) to protect the hoses from the sharp edges - since the standard rounded black rubber grommets won't work with an oblong hole.
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Old September 26, 2007, 02:38 PM
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Quote:
Originally Posted by 3.0charlie View Post
Good idea, you'll need some grommets (also called caterpillars) to protect the hoses from the sharp edges - since the standard rounded black rubber grommets won't work with an oblong hole.
I was thinking just standard rubber "u" channel edging would do the trick.

It's nice to have a bunch of old case sides kicking around that I can experiment with...... :)
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Old September 26, 2007, 02:41 PM
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"U" channel edging is very similar to a caterpillar strip and will do the trick.
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