Questions tagged [fan]

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Increasing airflow of fan

I learned at at young age from a physics kit that one can blow up a large bag with your mouth by blowing into it from a distance and letting the air pick more air with it. Later in life when Dyson ...
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is there a difference in performance between these two fan designs

These two fans are usually used in hairdryer is there a difference between them in performance if both have same rpm and same outer diameter.
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Routing the flow from an axial "box" fan

I have a project where I need to generate a certain flow rate to levitate a ping pong ball using the Bernoulli principle. From some rough calculations, I found that it would take about 30 CFM through ...
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How does temperature not affect fan airflow?

Please correct me if I am wrong : fans are devices moving a constant volume of air, given a constant rotation speed. Though, flowrate depends of the total resistance of a circuit and the ability of ...
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How can a fan keep spinning normally but suddenly move very little air?

I have a small portable fan, around 15 cm in diameter and lately it is behaving oddly. Basically I turn it on, the airflow is good but then after 10 minutes or 30 minutes or sometimes hours, the ...
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Why does the manual to my floor fan tell me to pull out the cord whenever it's not in use?

In the manual to my just-bought floor fan, it says this (among many other weird requirements/expectations): Pull out the plug from the power point when the product is not in use. Do not pull the ...
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How to select a fan blade for my application (strong, focused breeze)

My question is how fan blade design relates to the focus of the air leaving the fan. I am looking to generate the most focused breeze I can with a fan blade, excluding additional ducting etc, the fan ...
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3 votes
1 answer
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Fan performance curve

I am being asked to compare a fan which is going obsolete with its proposed replacement. From a mechanical and electrical point of view, they are almost completely identical so I have no concerns from ...
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What size of fan requires motors with a transmission? [closed]

I am wondering at what fan size/speed a direct drive motor is no longer sufficient to drive a fan? Phrased alternatively, what size/speed of fan requires motors with a transmission? For an axial fan.
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