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Focused Flow

Designed for superior performance in pressure demanding applications such as heatsinks and radiators, the Focused Flowô frame features eleven stator guide vanes that straighten, channel and focus the airflow, which allows the NF-F12 to rival the performance of conventional fans running at much faster speeds.


Focused Flow


Focused Flow


The NF-F12ís stator guide vanes are set out in Varying Angular Distance and feature Vortex-Control Notches. Both measures help to spread the noise emission over a broader frequency spectrum and thus make the fanís sound pattern more agreeable to the human ear.


Varying Angular Distance


Moving over the stator guide vanes, the fan blades create pressure pulses. This type of rotor-stator interaction significantly contributes to the fanís overall noise emission. With a uniform distribution of the stator vanes, the relative geometrical constellation of the rotor blades and the stator guide vanes is identical each time the rotor moves over the next stator vane. This means that each time a stator vane is passed by a rotor blade, the same pressure pulses are created. Acoustically, these periodic pulses lead to noises at distinct frequencies and manifest themselves as frequency spikes in the fanís acoustic spectrum, giving it a more tonal and distinguishable character. To avoid this phenomenon, the NF-F12ís stator guide vanes are set out in Varying Angular Distance (between 31į and 37į). Due to this measure, the geometrical situation between the rotor and the stator parts is slightly different each time the rotor moves over the next stator vane, which results in aerodynamically different pressure pulses and hence spreads the noise emission over a broader frequency range. Producing a less tonal and more broadband acoustic profile, the VAD stator guide vanes make the fan more agreeable to the human ear and let it blend into the background noise more easily.


Varying Angular Distance Spectrums


First introduced with the Noctuaís much acclaimed NF-P12 fan, Vortex-Control Notches are an advanced aerodynamic design measure that serves a twofold purpose: Firstly, Vortex-Control Notches make the flows along the suction and the pressure side of the blades or stator guide vanes mix more smoothly at the trailing edge, allowing for less turbulence and velocity loss, which leads to increased efficiency and reduced noise emission.


Vortex Control Notches


Secondly, Vortex-Control Notches also help to make the fanís acoustic profile more pleasant to the human ear. Due to the Vortex-Control Notches, trailing edge vortices are split up into several smaller vortices, each having slightly different tonal characteristics. This has a similar effect as the Varying Angular Distance of the stator guide vanes insofar as the noise emission is spread over a wider range of frequencies and frequency spikes are reduced. As a result, the fanís noise pattern is perceived as much less annoying and more agreeable to the human ear.


Vortex Control Notches





Noctua
23.04.2014 - Crazypc.ro NH-D15
Test verdict: "Noctua își păstrează tradiția și continuă să ofere fanilor Noctua silențiozitate și performanță bună într-un singur pachet. Cu un design foarte reușit care a înlăturat problemele celebrului NH-D14, NH-D15 pe tot parcursul testelor s-a comportat impecabil." (Vlad Buluta, Crazypc.ro)
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23.04.2014 - ExtraHardware.cz NH-D15
Test verdict: "A to hlavne pre vynikajúce ventilátory, ktoré v kooperácii s pasívom perfektne fungujú i pri nízkej hlučnosti. K výslednému efektu lepšiu alternatívu asi nenájdete." (Ľubomír Samák, ExtraHardware.cz)
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22.04.2014 - WASD.ro NH-L12
Test verdict: "Daca cumva prindeti vreo reducere va recomand sa il achizitionati fara sa ezitati. Merita!" (Octavian Fulger, WASD.ro)
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22.04.2014 - ENG PC NH-U14S
Test verdict: "المشتت NH-U14S قدم أداءًا رائعًا غير متوقع وكان هذا بسبب اختلاف التصميم عن أخيه الأصغر NH-U12S أيضًا بسبب المروحة ذات القطر 14CM والتي يتحرك الهواء من خلالها بأسلوب أفضل من مروحة 12CM، أما عن الصوت فهو أهدأ ويشبه كثيرًا NH-D14 فينصح بهذا المشتت للوحات X79 ومعالجات LGA 2011 خاصة إن أردت كسر سرعتها، لذا أنصحك بتبديل مشتتك إن كان ذا صوت مرتفع وأداء أقل من المشتت NH-U14S" (Amir Abd EL Fattah, ENG PC)
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