Maybe we should "just" find the optimal fan geometry that produces no audible turbulences. Would be a nifty task for a distributed computing project: let the geometry evolve by using some sort of GA (genetic algorithm) and do finite element calculations to determine the noise (=fitness)...

Yes. And I'm charging entry fees to my new and personal modern arts museum )).

Let me think what that work should express... hmmm... hacker insanity?

Problem: I'd guess that that solution will create A LOT OF turbulences .

Cool. Do the pre-built koolance systems use water-cooled PSUs? The price tags indicate a "NO".

Any recommendation for a pre-built system with complete water-cooling support?

Pehaps slighly, but I think you're missing the point. The internal fluid of the heatpipe boils at one end and recondenses at the other "cool end". These phase changes from liquid to gasseous and back will typically require a lot of calories for a very small change in temperature. From a theoretical...

Is there any watercooling solution that does not only provide heat sinks for GPU and CPU but also for the PSU? Maybe even including a specifically crafted PSU?

How about combining the acceleration of ions with heat pipes? I guess that the radiator part of a heat pipe is limited in size because of the passive heat transport. Is that correct?

If yes, could we possibly make heat pipes even more efficient by accelerating the internal gas transport?

Tibors wrote:If it is solid, then it is not a heat PIPE. Then it is just a copper rod.

Are you sure that vendors care for a strict definition? I'm not. A pipe is a pipe. A copper pipe with solid copper in it is still a pipe.

How do heat pipes rely on phase change? They have fluid inside them that evaporates on one end and then goes back to liquid at the other, and the high energy delta between liquid and gas phases are why they are so good at transporting heat. Uhm, yes, that's what I meant. But aren't most heat pipes ...

jaganath wrote:Heatpipes are very elegant solutions, because they are unpowered (externally) phase-change cooling devices, and phase-change gives you the ability to move large amounts of heat with relatively small amounts of working fluid.

How do heat pipes rely on phase change?

So I guess the equations are only valid for RPMs above 1500 or so What makes you say that? Just a guess. :-) Apart from that, there certainly is some sort of a threshold level: below some RPM, the fan won't even push a single molecule that is at a certain short distance. Metals are heavier than air...

> In all of the Fan Law equations, the fan or fans are assumed to have the same efficiencies at the various operating points under consideration. In extreme cases, such assumptions are usually wrong. The world is usually only linear in a first approximation :-). So I guess the equations are only val...

This grime problem is also very problematic in gaseous particle detectors. But one might try to use fine-grained air filters and then look if it works in the long term. Maybe there is a better solution: one CAN use moving parts. One just has to use a very large fan that rotates slowly enough to not ...

You may need to do some research and development first. A single needle probably does not reach enough air space to generate enough ions. My guess is also that due to the high field gradient at the tip of the needle, turbulences are likely to occur there, too, but I'm not sure of that. A parallel gr...

A back to basics approach might just have a grounded open mesh at the end of an insulating tube with the discharge needle at the other end. No more obstruction than say the back grille of an ATX power supply. A discharge needle? Don't think that would work very well. You may produce the ionized air...

The PDF says: 0.3 CFM/W, not 0.03. it also says: air pump efficiency was comparable to that of conventional rotary CPU cooling fans. And no, the wind does not stop at the oppositely charged plates or wires: there, the ionization is removed and the inertia of the particles is mostly retained. I also ...