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Nine Blade Design
The pressure-optimized Nine Blade Design of the NF-P12 (P stands for pressure, power and performance) has been specifically developed for high-impedance applications such as CPU coolers, water-cooling radiators, power supplies or cases with restrictive fan grills. It achieves outstanding static pressure and high airflow at very low noise levels.

While most conventional 120mm rotors possess seven comparably narrow fan blades, the NF-P12's Nine-Blade Design uses nine large, closely spaced blades with a relatively low angle of attack in order to achieve maximum static pressure and high airflow. As a result, the NF-P12 provides no less than 1.68 mm H2O at 1300 rpm, which is something that other fans merely achieve at 1600 rpm or more.

Nine Blade Design


As a matter of principle, increasing the number of blades involves the risk of increasing the aerodynamic noise in general and noises caused by rotor-stator interaction in particular. Basically, an increase in static pressure usually brings about higher noise emissions. In the case of the NF-P12, this problem is dealt with by adding Vortex-Control Notches to the blades' trailing edges. Due to the two notches at the trailing edge, the flows along the suction and pressure side mix more smoothly. This allows for less turbulence and velocity loss, which leads to a significant reduction in noise emission as well as increased efficiency. In order to achieve the smoothest possible transition and maximum noise reduction, the Vortex-Control Notches are rounded in shape.

Nine Blade Design


In addition to optimizing the joining of the flows at the trailing edge, the Vortex-Control Notches fulfil the task of psychoacoustic optimization: Due to the Vortex-Control Notches, trailing edge vortices are split up into several smaller vortices. Thus the noise is spread over a wider range of frequencies and therefore perceived as much less annoying.

Nine Blade Design


The Vortex-Control Notches' effect of psychoacoustic optimization is further enhanced by the staggering of the notches. The Vortex-Control Notches are staggered from blade to blade so that each blade creates a different vortex pattern. As a result, the fan's noise emission is better spread over the frequency spectrum and thereby makes it yet more pleasant to the human ear.

Nine Blade Design


Links:
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Noctua
17.04.2014 - ENG PC NH-U12S
Test verdict: "المشتت NH-U12S من شركة نوكتشوا Noctua ربما لا يُعد أفضل الخيارات في فئته السعرية من حيث الأداء إلا أنه الأفضل من حيث هدوء الصوت، ولكن يُنصح بهذا المشتت لمن يستعمل معالجات Haswell أو Ivy/Sandy Bridge وبالتأكيد معالجات AMD الأقل من 125W ف استهلاك الطاقة لأفضل أداء ممكن مع صوت هادئ للغاية، فنعم لازالت مشتتات نوكتشوا لفئة مُعينة من المستخدمين الذين يودون الصوت المنخفض للغاية مع مشتت هوائي جيد، ولذلك فالمشتت يستحق أن تستبدل مشتتك الاعتيادي أو الاحترافي إن كان أقل ف الأداء أو كان صوته لا يُحتمل." (Amir Abd EL Fattah, ENG PC)
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17.04.2014 - mod-your-case.de NH-D15
Test verdict: "Mit dem NH-D15 hat Noctua einen neuen Kühler in sein Sortiment aufgenommen, welcher sich nicht nur durch seine Kühlleistung an Overclocker und Enthusiasten richtet, sondern auch durch seine Laufruhe, welche gerade über die PWM Steuerung dank der sehr guten Kühlleistung erzieht werden kann auch für Silentliebhaber das Maß aller Dinge darstellt." (Patrick Seus, mod-your-case.de)
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17.04.2014 - ChipLoco.com NH-D15
Test verdict: "So all in all, if you are in market for a high-end CPU cooler, the NH-D15 should be on the top of your list." (Afaq Shahid, ChipLoco.com)
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