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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
25.04.2015 - BestPCInfo.pl NH-L9x65
Test verdict: "Noctua NH-L9x65 to wprawdzie bardzo kompaktowy cooler CPU ale mimo to jest on godnym następcą modelu NH-L9. Po pierwsze oferowana przez niego wydajność już bez problemu wystarczy do zastosowań przy chłodzeniu nawet wydajniejszych procesorów (a przynajmniej jeśli chodzi o jednostki 4-rdzeniowe). Po drugie producent nie rozdziela już tego modelu coolera na wersję dla AMD i wersję dla Intel a zatem jest to rozwiązanie zdecydowanie bardziej uniwersalne." (Łukasz Talkowski, BestPCInfo.pl)
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24.04.2015 - hwresources.org NH-L9x65
Test verdict: "Ci sentiamo di consigliare caldamente il nuovo Noctua per tutti gli usi, non solo per HTPC, tenere testa e battere soluzioni piý grosse dimostra la cura in cui Noctua ripone nei suoi prodotti." (Michele Mura, hwresources.org)
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22.04.2015 - OCDrift.com NH-U9S
Test verdict: "In the end, the Noctua NH-D9L, U9S and L9x65 are certainly among the best 92 mm low-profile coolers in the market that money can buy. For rig builders who are planning to set up a small HTPC and small form factor system, these coolers could be the perfect choice for you!" (Kevin Owi Kheng Him, OCDrift.com)
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22.04.2015 - The Tech Buyer's Guru NH-L9x65
Test verdict: "All in all, then, the Noctua NH-L9x65 offers a winning combination of build quality, features, and performance for a niche, informed audience, willing to work within its limits to achieve truly stellar performance in an ultra-compact form factor." (Ari Altmann, The Tech Buyer's Guru)
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