Aluminum fans?
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Aluminum fans?
I searched the site and alum fans weren't talked about much. Are they not quiet enough? I was looking at an Evercool 120MM alum fan that has a rating of 84.5 cfm @ 30 db Which sounds pretty good to me. At night I would just use a fan controller to bring it down some.
I would think aluminum fans would blow more air quieter than plastic or am I wrong?
I would think aluminum fans would blow more air quieter than plastic or am I wrong?
Yeah, but they sure do make a purty mod to a Zalman 7000B-AlCu. And no weight penalty when you cut off all the aluminium.
And yes, the frame corners are quite solid - it would be much harder to cut them away for use on a Thermalright XP-n.
I tried a 92mm example and decided it was too noisy to be worth modifying for my unwindowed 7000B, so used a CompUSA Mad Dog Whisperfan instead. Nice improvement when isolation-mounted on the Zalman, and cooling performance was about 5C hotter then the current XP-120/Papst setup.
Airflow would not be affected by material. Airflow is primarily determined by blade diameter, shape and speed.
And yes, the frame corners are quite solid - it would be much harder to cut them away for use on a Thermalright XP-n.
I tried a 92mm example and decided it was too noisy to be worth modifying for my unwindowed 7000B, so used a CompUSA Mad Dog Whisperfan instead. Nice improvement when isolation-mounted on the Zalman, and cooling performance was about 5C hotter then the current XP-120/Papst setup.
Airflow would not be affected by material. Airflow is primarily determined by blade diameter, shape and speed.
Did you think that because teflon is non-stick that it would enhance the air movement? That slipperiness is it's effect on surface tension of fluids (a zero velocity effect), not the drag of fluids moving across the surface.
Surface finish (and blade shape) will be the predominate effect on airflow, and the Sharkoon dimples are an interesting idea from golf balls - not sure if the phenomeon applies, but it might. So teflon wouldn't change the airflow measurably compared to existing plastic fans because the surface finish of the blades are already excellent for the relative air velocities involved.
And I'll bet if somebody thought they could market a teflon blade benefit they would, even if it wasn't real. Hey, maybe here's the chance for you to make some big bucks in the PC market?
Surface finish (and blade shape) will be the predominate effect on airflow, and the Sharkoon dimples are an interesting idea from golf balls - not sure if the phenomeon applies, but it might. So teflon wouldn't change the airflow measurably compared to existing plastic fans because the surface finish of the blades are already excellent for the relative air velocities involved.
And I'll bet if somebody thought they could market a teflon blade benefit they would, even if it wasn't real. Hey, maybe here's the chance for you to make some big bucks in the PC market?
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not quite, impellers always have a shroud of some sort. so a small airplane has a propeller since it's operating in free air. jet engines (or your jet ski example) have impellers because they are shrouded. ducted fans are also impellers... it is incorrect to call them propellers. the shroud makes a big difference. ask any r/c airplane pilot... if you take the shroud off a ducted fan engine, it won't provide any real thrust.hofffam wrote:impeller = propeller = blade assembly.