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  2. Physics of whistles - Wikipedia

    en.wikipedia.org/wiki/Physics_of_whistles

    Periodic vibration of a cyclone separator would indicate vortex instability. Large centrifugal fans sometimes use radial inlet blades that can be rotated to control the flow into the fan; they create a swirling flow. At near shutoff, where the swirl is very high, rotating blade stall of the fan blades occurs. Although not researched, it is ...

  3. Let an Oscillating Fan Create a Cooling Summer Breeze — and ...

    www.aol.com/let-oscillating-fan-create-cooling...

    Buy: Dreo Cruiser Pro T1 Tower Fan $89.99 . 2. Lasko Elegance & Performance Pedestal Fan RUNNER UP. This is the new and improved version of the standing oscillating fan that most of us grew up with.

  4. Fan (machine) - Wikipedia

    en.wikipedia.org/wiki/Fan_(machine)

    A household electric fan A large cylindrical fan. A fan is a powered machine that creates airflow. A fan consists of rotating vanes or blades, generally made of wood, plastic, or metal, which act on the air. The rotating assembly of blades and hub is known as an impeller, rotor, or runner. Usually, it is contained within some form of housing ...

  5. Leeson's equation - Wikipedia

    en.wikipedia.org/wiki/Leeson's_equation

    Leeson's equation is an empirical expression that describes an oscillator's phase noise spectrum.. Leeson's expression [1] for single-sideband (SSB) phase noise in dBc/Hz (decibels relative to output level per hertz) and augmented for flicker noise: [2]

  6. Popular oscillating fans to beat the heat - AOL

    www.aol.com/popular-oscillating-fans-beat-heat...

    An oscillating fan can help keep an entire room cool. These are top-rated options from Amazon, Target and more. Skip to main content. 24/7 Help. For premium support please call: 800 ...

  7. The best air purifiers of 2025 - AOL

    www.aol.com/lifestyle/best-air-purifiers...

    Turning up the fan setting is the only way to get a bit of white noise. You’re going to need the remote. Most of the functionality of the Cool Gen1 is controlled via the remote.

  8. Oscillation - Wikipedia

    en.wikipedia.org/wiki/Oscillation

    Laser (oscillation of electromagnetic field with frequency of order 10 15 Hz) Oscillator Toda or self-pulsation (pulsation of output power of laser at frequencies 10 4 Hz – 10 6 Hz in the transient regime) Quantum oscillator may refer to an optical local oscillator, as well as to a usual model in quantum optics.

  9. List of Dyson products - Wikipedia

    en.wikipedia.org/wiki/List_of_Dyson_products

    The Dyson V8 is an upgraded version of the V6 with better battery life (up to 40 mins without the brush heads), [13] a larger dust cup capacity, modifications to the debris emptying process (Called the "Hygienic dirt ejection system"), and reported quieter operation than its predecessor due to a different noise frequency and noise dampening ...