What do the D-tek Fuzion nozzles actually do?

[marscay]

i tested a q660 and a q685 both lapped the 6850 was an es i work for myself and i have no reason to xagerate the findings were what i found and no matter which block is used if the loop is of a bad design yure wasting money chasing around after blocks as the block is the end of the chain

well no, all parts play their roles to a certain extent. many facets to watercooling, the block is just one of them.

in fact i'd say you should concentrate on mounting next time as that's probably how you got such skewed results, unless of course you're just taking the michael.

my fuzion keeps my q6660 @3.8 under 50c no matter what i throw at it with a MCW30 in the loop as well, i don't believe for a second that zalman block would have me at low 40's ......dreamland

 

[SillyHeatsink]

If the purpose of these thingies is to trigger boundary layer transition from laminar to turbulent, they fail hard - ALL flow inside a water cooling loop will be fully developed turbulent (due to something called the Bernoulli number). I suspect the rings have little blocks or notches inside them to induce vortices, which would improve mixing in the flow and hence thermal transfer. This will, however, as the first poster notes, 'restrict the flow slightly' and slow it down. But I'd guess the effects of the retardation are minimal compared with the gains from the vortices.

Anyone got any pictures of these, I'm intrigued.

 

[wolvers]

I suspect the rings have little blocks or notches inside them to induce vortices, which would improve mixing in the flow and hence thermal transfer. This will, however, as the first poster notes, 'restrict the flow slightly' and slow it down. But I'd guess the effects of the retardation are minimal compared with the gains from the vortices.

Anyone got any pictures of these, I'm intrigued.

Just google it. Looks like they are a venturi maybe. If they work like a venturi in a carburetor then I guess they'll be speeding up the flow of water through the block?

 

[fornowagain]

Just google it. Looks like they are a venturi maybe. If they work like a venturi in a carburetor then I guess they'll be speeding up the flow of water through the block?

Obviously the flow rate is constant through the block, but velocity increases locally at the nozzle with a pressures drop. Take a typical flow 2GPM & 7/19" bore. The water moves at 1.3m/s, an Re number at 20C of 14430 (Reynolds of 2300+ is turbulent), so dropping the diameter to the 4.5mm nozzle increases the velocity to 7.9m/s and Re ~ 35550. The nozzles are smooth bore, so no inducing mixing. Just more directed flow and increased turbulence over the 'relatively' static pin area.

 

[Crashgate3]

Does anyone know if they noticaby affect the flow-rate (or, more specifically, the temps) for blocks further down the loop?

 

[MikeTimbers]

They can't affect the flow-rate "further down the loop". Flow-rate is constant, although pressure can change slightly at different points and water speed can vary. At a restrictive part of the loop, the water will travel faster but since it is going through a smaller point the amount of water (the flow-rate) is the same as through a slow fat part.

 

[PinkFloyd]

What sort of difference are people finding the washer makes?
Likely to be fitting my Dtek tomorrow on my Q6600, going to go with the quad nozzle, just curious as to how the washer might help

 

[Crashgate3]

They can't affect the flow-rate "further down the loop". Flow-rate is constant, although pressure can change slightly at different points and water speed can vary. At a restrictive part of the loop, the water will travel faster but since it is going through a smaller point the amount of water (the flow-rate) is the same as through a slow fat part.

By 'further down the loop' I mean is that if one part of the loop is restrictive then it will slow the entire flow in the loop and affect the temperatures of other blocks - I could gave said 'further up the loop' and it would mean the same thing in this case. Obviously the nozzled block works better despite any restriction in the flow (or there wouldn't be much point in it) but I was wondering if the entire flow might be slowed enough to affect the temperatures of other non-nozzled parts like GPU and NB blocks conected to it.

 

[YZFAndy]

I'm planning on getting a Fuzion when I sort my watercooled PC out. So it's worth getting the nozzles then? I

Who has added a nozzle kit later and how much did it drop things?

Does anyone know if they noticaby affect the flow-rate (or, more specifically, the temps) for blocks further down the loop?

What sort of difference are people finding the washer makes?

Apparently they make no difference or if they do its a secret

 

[PinkFloyd]

Apparently they make no difference or if they do its a secret

Your the first person I've seen to say they make no difference

 

[Andrew G]

Very sorry if this a noob question, I have been reading around the subject last week since I want to build my 1st water cooled system.

Like in some modern central heating plans specially for flats and taller building they utilise a heating manifold so than the water is kept at a contant pressure across the system rather than it getting weaker the higher it got.


Would it not be a good idea to use a manifold to keep the pressure contant to all parts of the loop rather than serial loop? So non return values could be used?

All I can see from this post is that the difference is almost un-measureable so just the normal bragging rights for the pub?

 

[cavemanoc]

all parts play their roles to a certain extent. many facets to watercooling, the block is just one of them.

^^ What he said.

Much of watercooling is about small incremental gains. It's down to how much effort/expense you're prepared to give to gain those last few degrees. The nozzels may not make a huge difference, but if you add up all the little improvements you start to see results.

Same reason that few people bother to make the leap to phase/chiller cooling, but those that do appreciate what they have

(The pressure drop across the system is negligible as you are talking about a rise of a maximum of about 1 foot in most cases - unlike the flat! - so manifolds are not required. The bloke who plumbed his system into his swimming pool might have thought about it though!)