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Holes in the fan side

H

hifisoftware

Member
Thermaltake silent cat fan (used in silent boost CPU cooler) has a fan with holes on the sides. http://www.thermaltake.com/coolers/comboCool/a1780silentCat8/SilentCat8.htm (scroll down to see how air enter it)
Here are some specs for 90mm fan: http://store.yahoo.com/svcompucycle/a2013-14.html. 52CFM at 21dBA.

Interesting idea and I am thinking about drilling some holes into my exhaust and CPU coler fans. (Gotta find my Dremel, it gotta be somewhere)

I am concerned whether it would work as indicated though. Centrifugal force will try to move air in the wrong direction (blowing air out of side holes). On the other hand fan action should help it work it as indicated. If it works by blowing air out of the sides (opposite to what ThermalTake claims), then I guess I can use it for intake fans.

Has anyone tried this? Did it improved fan's performance? According to ThermalTake this should increase CFMs without adverse effect on the noise? Sounds too good to be true ...

I am planing to drill one hole and check which way air is going to go into the sde or out of it.
 
your specs are wrong 31.77CFM @ 21 dba. I don't know about it it might make sense, but it still seems like a crock of sh*t
 
sounds like something to use "extreme" methods and break out my sonic listener( to listen for freon leaks in AC systems) and see if it makes a difference....i dont think it makes sense...but its getting great results...but YMMV as with all fans, hard to say unless theres a good GP review
 
Noise change is interesting, but more important if it's going to improve CFMs at all?

I figured how a can test it. I can place a piece of paper at some distance from the fan. I will fix paper at one side. Then I can measure pressure by looking at how much not fixed side of the paper has moved. I probably should build a small duct to guide air for better measurments.
 
thermalfake gimmick.

White color, different to traditional styling surprised they didnt say it was in a vibration-damping shade of cream or something.
 
This has to be a gimmick. Instead of having the holes (slots) in half of the side, why not just remove that part?
 
Originally posted by: hifisoftware

I am concerned whether it would work as indicated though. Centrifugal force will try to move air in the wrong direction (blowing air out of side holes). On the other hand fan action should help it work it as indicated. If it works by blowing air out of the sides (opposite to what ThermalTake claims), then I guess I can use it for intake fans.

I am planing to drill one hole and check which way air is going to go into the sde or out of it.
Click to expand...

Not trying to be an ass, Centrifugal Force = inertia which is rotational mass. Its an appearant force. Centripetal force is what may cause air to flow out of those cracks in the fan's body - since centripetal force is the force that acts tangentially from the rotational movement. Inertia is what appears to keep things close to the axis of rotation (ie the opposite force to centripetal).

Im not quite sure how thermaltake got that design to work. I would think that verticle cracks cut with the geometry of the blade going with the blade direction might help negligably - while preventing a bit of the centripetal effect. - Not something easy to do on a plastic fan casing - more for the Evercool aluminum casings where you can do some fine milling, and appropraite chamfering.
 
Total and complete gimmick.

In fact, if you look at high speed fans, they are more efficient and quieter when they are working in a tight tolerance tube that surrounds the blade ends to reduce vortice shedding.

What they are saying is that they've increased flow. But the opening the air travels OUT didn't increase ladies and gentlemen - and the blade design didn't drastically change to improve head pressure, so you'd get the same measurable air flow, efficiency, and pressure without those stupid little "feel good" slots.
 
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