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is there a standard computer fan that spins clockwise?

post #1 of 14
Thread Starter 
trying to test the application of counter-rotating turbine design to see if static pressure(thrust) would be greater then conventional fans at low rpm's(below 1300rpm).
post #2 of 14
ArcticCooling Alpine64's fan spins clockwise. Also once I had two identical stock AMD fans with opposite directions From my experience - the result with 2 fans suffers from that.
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post #3 of 14
Thread Starter 
Quote:
Originally Posted by ronnin426850 View Post
ArcticCooling Alpine64's fan spins clockwise. Also once I had two identical stock AMD fans with opposite directions From my experience - the result with 2 fans suffers from that.
yah most intel stock coolers are clockwise spinners also. but I'm trying to find one in a standard 80mm/92mm/120mm/140mm frame so I can do some tests with them using the counter rotating turbine theory. it's supposed to have higher efficiency in producing thrust(static pressure).
post #4 of 14
Quote:
Originally Posted by psyclum View Post
yah most intel stock coolers are clockwise spinners also. but I'm trying to find one in a standard 80mm/92mm/120mm/140mm frame so I can do some tests with them using the counter rotating turbine theory. it's supposed to have higher efficiency in producing thrust(static pressure).
My 2 AMD fans were standard 80mm, and all I know is that my temps raised Can you link me to that theory, if you're reading it off somewhere on the web? It got me interested
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post #5 of 14
Link to Wikipedia

Sounds like they produce more thrust because the props waste the air with a tangential flow. I don't think this applies to case fans since they are usually surrounded by a shroud of some sort. The only coolers I could see benefiting from this (if I understand it correctly) are the Intel stock HSFs.
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post #6 of 14
Can't you just flip the fan? Am I missing something?
    
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post #7 of 14
Quote:
Originally Posted by daydream99 View Post
Can't you just flip the fan? Am I missing something?
no, bc flipping it would just force air between the fans, cancelling out all of your pressure. What he is trying is fans pushing the same way but with different rotations. Theoretically it should work (i do believe that jet/turbine engines use the same principle he is trying to apply), but i doubt that much improvement will be seen. I hope it works well though, just bc the idea is interesting.
Edited by wrathin - 10/16/11 at 4:03pm
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post #8 of 14
Thread Starter 

well, it's "supposed to" be more efficient and produce a much more directional thrust (sorta like the silverstone AP121/AP181 fans).

in the silverstone fans, they used a "passive" grill to channel the airflow in a directional pattern. In the concept i'm thinking about, it would be a "active" system where the contra-rotating fans will actually produce a "jet like" air flow pattern which would have much higher static pressure at the exhaust end due to the directional nature of the airflow.

"IF" the concept works, it should benefit future GPU cooling solutions in terms of external exhaust configuration. a pair(or 2 pairs) of 40mm contra-rotating fans providing a jet of cool air for the dual slot gpu cards and a full dual slot width heatsink to carry the air out of the case.

anyway, crazy ideas at work here
post #9 of 14
Thread Starter 
Quote:
Originally Posted by ronnin426850 View Post
My 2 AMD fans were standard 80mm, and all I know is that my temps raised Can you link me to that theory, if you're reading it off somewhere on the web? It got me interested
unfortunately, the airflow on the contra-rotating fans need to blow in the same direction. your experiment had them blowing against each other thats why the results were disappointing.
post #10 of 14
Note - whenever I have put two CCW fans togehter airflow suffers - usually quite badly.

Papst makes a clockwise-rotating fan. When I put it up to a CCW-rotating fan it did not reduce airflow; but it did not improve airflow.

According to a paper by Sanyo Denki engineers the trailing fan in a contra-rotating pair adds to the static pressure, not airflow (cfm). And like vanes, the trailing fan in a CR pair improves directionality.

Arctic Cooling cage-type fans generally rotate clockwise.

For CR fans, check this.
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