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Focused Flow

Designed for superior performance in pressure demanding applications such as heatsinks and radiators, the Focused Flow™ 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-F12’s 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 fan’s 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 fan’s 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 fan’s acoustic spectrum, giving it a more tonal and distinguishable character. To avoid this phenomenon, the NF-F12’s stator guide vanes are set out in Varying Angular Distance (between 31° and 37°). 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 Noctua’s 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 fan’s 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 fan’s noise pattern is perceived as much less annoying and more agreeable to the human ear.


Vortex Control Notches





Noctua
19.12.2014 - ElektronikTest.dk NH-U9S
Test verdict: "Køleevne Vi ligger jo ikke på samme niveau som de store modeller, men stadig godt klaret i forhold til størrelsen af køleren. Og med en ekstra blæser på, er der ingen tvivl om at de slår mange, hvis ikke alle andre kølere i denne klasse." (John Thorn, ElektronikTest.dk)
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18.12.2014 - Tom's Hardware NH-L12
Test verdict: "For a Mini-ITX CPU cooler, the Noctua NH-L12 is somewhat of a luxury product. But like any luxury item, this heat sink comes with all the bells and whistles. While the price might be high compared to competing coolers, the NH-L12’s quality, configurability and extras make this cooler a value nonetheless." (Thomas Soderstrom, Tom's Hardware)
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18.12.2014 - hardwarepoint.net NH-U14S
Test verdict: "Der NH-U14S ist noch leistungsfähiger als der ohnehin schon gut abschneidende Dark Rock 3 und hält somit die CPU noch kühler. Hinzu kommt das bessere Montagesystem, was am Ende auch einen teureren Einkaufspreis nach sich zieht." (Dennis Heinze, hardwarepoint.net)
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18.12.2014 - Donanimhaber Forum NH-U9S
Test verdict: "Uzun lafın kısası ufak form faktörde bir bilgisayar topluyorsanız ve size ram,ekran kartı, kasa uyumuyla sıkıntı yaşatmayacak bir hava soğutma çözümü arıyorsanız NH-U9S ye bakmanızı mutlaka tavsiye ederim. Zira şu an piyasada pek alternatifi ortada gözükmüyor. Altı sene garantide cabası." (Ali Emre Alıcı, Donanimhaber Forum)
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