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Flow Acceleration Chanels

Boundary layer separation from the suction side of the fan blades leads to increased vortex noise and lower airflow efficiency. In order to suppress this phenomenon, the Noctua’s A-Series impellers feature suction side Flow Acceleration Channels. These channels alter the flow distribution on the suction side of the blades and speed up the airflow at the crucial outer blade regions. As flow separation is more likely to occur when the speed of the fluid relative to the fan blade is low, the increase in speed achieved through the Flow Acceleration Channels leads to significantly reduced flow separation, which permits lower vortex noise and higher airflow efficiency.



Flow Acceleration Channels





Noctua
25.11.2014 - BigBruin.com NF-F12 industrialPPC-2000 PWM
Test verdict: "In the end, all of these fans are worthy of the 'Recommended' award because they work well and you can count on them to do so for years to come. They also earn the 'Whisper Quiet' award because they can all operate in near silence while still providing excellent cooling. And finally, they earn the 'Great Idea' award, because it is great to see the Noctua line expanding to incorporate different options - and colors." (Jason Kohrs, BigBruin.com)
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25.11.2014 - digit.in NH-D15
Test verdict: "The best CPU air cooler we've ever tested. Period" (Siddhant Sharma, digit.in)
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25.11.2014 - TotlTech.com NH-D15
Test verdict: "الأداء هنا ممتاز جدا حيث انه يقدم أداء بفارق بسيط عن (درجتين الى أربعة درجات) عن المشتتات المائية المغلقة." (عن محمد سعد, TotlTech.com)
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24.11.2014 - No Review Left Behind NH-D15
Test verdict: "If your wallet and your computer case can handle such a behemoth of a cooler (165mm in height) then I can't recommend the D15 enough." (Miguel Coelho, No Review Left Behind)
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