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Do 90 degree bends in loops actually affect cooling..? - Page 2  

post #11 of 70
Thread Starter 
Yeah the ONLY restriction I could see is if the 90 degree is right near the pump, at other places maybe it'd slow the water down and reduce the pressure, but I would imagine not enough to actually drop temps or cause problems.

Im assuming, I dont actually know.
post #12 of 70
I have a 90deg single-rotary adapter and rotary male-male coupler (all Bitspower) attaching my MCP35X2 to the bay res, and I havenever once had an issue... In ffact, I can push close to 3GPM through my loop at max, and I have a crapload of rotary angled fittings (not to mention a fairly high Restriction CPU block). Even with 2 of the most powerful common pumps @ full speed, I get zero cavitation...
   
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post #13 of 70
Thread Starter 
Alright, in that case this is all bullocks tongue.gif
post #14 of 70
Yep... it's really pretty simple if you just look at flow being a characteristic limited by the single most restrictive part in your loop. I you have magical blocks that somehow managed to be less restrictive than a 90-degree fitting... then in that loop, adding 90-degree fittings might reduce your flow (albeit still by only a very tiny margin - and definitely not noticeable). In reality the CPU block and possibly the GPU block(s) are so much more restrictive that you can reasonably add a dozen elbows and not make any difference at all. biggrin.gif
Edited by DiGiCiDAL - 5/29/13 at 8:42pm
post #15 of 70
Or if you have one of the Watercool Mo-Ra radiators that have 27 180degree bends XD
Those cause a hell of a lot of restriction tongue.gif
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post #16 of 70
Quote:
Originally Posted by ZytheEKS View Post

Or if you have one of the Watercool Mo-Ra radiators that have 27 180degree bends XD
Those cause a hell of a lot of restriction tongue.gif

That's actually a good point... in many cases your radiator alone will have tighter turns (using possibly much smaller pipe/tubes) and yet it's not a concern for almost anyone. Naturally, since you have to have one or you're not going to be cooling much of anything! rolleyes.gif

I guess the best rule of thumb would simply be only use 90-degree fittings where you actually need them.

I think most people would do this instinctively however - it's not like I've seen anyone say "hmmm... I could run this tube perfectly straight from point A to B... but instead I think I'll make it zig-zag across my case a few times first"!

lachen.gif
post #17 of 70
Thread Starter 
Yeah.. I mean Im used to bogus crap being thrown around, so for a while I was wondering if 90 degree bends have a huge effect.

I really hate wannabe noobs who spread around this crap...

It didnt click in my head at all, thought maybe I was missing some technical details about pump rates and whatnot
post #18 of 70
LOL... there's way less in watercooling circles than there is in audiophile circles. At least I've never heard anyone claim that they got a faster overclock by placing rocks on their case, or by using cryogenically treated SATA cables made of unobtanium. biggrin.gif

Thermodynamics and hydrodynamics are a little hard to grasp for many (myself included to a large extent) - but in general, and largely thanks to people like Martin - you don't have to rely on speculation and theory... because someone has tried just about everything in pursuit of performance.

On topic... if the 90-degree-bends theory is bugging you... try some of the threads arguing about loop order - they can get really entertaining. (Coming from someone that has had their CPU block last in the loop to great success). ph34r-smiley.gif
post #19 of 70
This is probably the last thing in the world to worry about. But for your reference in fluid power terms, two 45's are better the a 90 for pressure drop. But honestly, do you guys even think there is much pressurization in there to impact pump efficiency? And this liquid is a relative incompressible, and not air which heats as it compresses.
post #20 of 70
Quote:
Originally Posted by DiGiCiDAL View Post

That's actually a good point... in many cases your radiator alone will have tighter turns (using possibly much smaller pipe/tubes) and yet it's not a concern for almost anyone. Naturally, since you have to have one or you're not going to be cooling much of anything! rolleyes.gif

I guess the best rule of thumb would simply be only use 90-degree fittings where you actually need them.

I think most people would do this instinctively however - it's not like I've seen anyone say "hmmm... I could run this tube perfectly straight from point A to B... but instead I think I'll make it zig-zag across my case a few times first"!

lachen.gif

Actually most radiators use a dual pass U flow system, so half of the tubes are all running in parallel. The combined area of the chambers running in parallel is usually quite a bit larger than the tubing you are using, and the chambers themselves have no bends or curves, but rather the chambers at the end create the U flow. This means most radiators will add little to no restriction to a loop tongue.gif

THEN there's the radiators that use tubes with 180 degree turns instead of chambers and charge 3x more money , because **** logic, that's why!
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