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Questions tagged [fan]

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2 answers
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are ducted fans better than turbines generating vaccum?

Basically I want to make a trap that sucks mosquitoes into a screen container for future studies, to do this I need to generate a vacuum and I need to choose whether to use a ducted fan (simpler) or ...
RHR's user avatar
  • 3
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1 answer
44 views

Why is the fan efficiency zero at high flow rate?

How is the fan efficiency zero at the highest flowrate point (at which there is zero pressure rise)? I know the fan efficiency is given as $fan\_efficiency = output\_power/input\_power$ where ...
GRANZER's user avatar
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36 views

How can I estimate the shape of stator vanes to straighten the flow of an axial fan?

I have an axial 140 mm fan which I need to connect to a duct and I need to design a converging duct as adaptor from circular to the shape and size of the duct I have. From past experiences, an axial ...
FarO's user avatar
  • 179
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0 answers
32 views

Aerodynamic design and characteristic of fan vs blower

I just learnt about the difference between a fan and a blower, namely the former providing high flow rate at very low outlet pressure (<1.1*inlet) and the latter providing a slightly increased ...
temporary_pigeon's user avatar
1 vote
2 answers
72 views

Help me choose an approach to gpu cooler design

I want to remake my gpu's cooler cause the original fans have a terrible bearing sound on low rpm and no amount of software solution helped. Anyway, I want to use 3x nf-a9x14 pwm 92mm fans as its fits ...
Nah's user avatar
  • 13
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0 answers
37 views

What are rule of thumb or technical standard for industrial fan?

I want to design a small centrifugal fan to transport wood dust. Is there any Handbook or ISO/DIN/ASME standard for industrial fan? For example, number of blade, hub size, shaft diameter, blade ...
Maaruf Bussri's user avatar
0 votes
1 answer
114 views

Why does my self-made air pump not blow air in the correct direction?

I am embarking on a project for building a low-noise air pump for use with things such as air mattresses or pool toys. I just find that the pumps sold at stores are way too noisy, plus it looked like ...
Meruje's user avatar
  • 3
0 votes
1 answer
79 views

Why does a centrifugal fan work better than an axial fan for high pressure drop systems?

I read that this is true, but I cannot understand why. Conversely, I heard that Axial fans are better for low pressure systems where large volumes of air need to be moved. More info on centrifugal vs ...
imagineerThat's user avatar
0 votes
1 answer
27 views

Failure of component due to natural frequency vs stress

lets take a component like a fan blade as an example. Is it right to conclude that it will fail even when the stress is within permissible limits but its operating frequency is close (close enough ...
AJAY SARAF's user avatar
0 votes
0 answers
48 views

Radial fan with both input and output on the same plane

An axial fan moves air from one side to the other, where the fan is placed on the plane normal to the axis: A radial fan, moves air from a normal axis to the same plane where the fan runs: Is there ...
Mark's user avatar
  • 101
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2 answers
570 views

Multiple inline fans

I have a chimney with a single 100 cfm exhaust fan. If I would add a second similar fan in the same chimney,in line with the first fan, what would happen? Would I move 200 cfm? Would I still move 100 ...
Geo's user avatar
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2 answers
280 views

How to theoretically determine the flow rate for a fan design?

I am trying to design a ducted axial fan. The fan will be pulling air through a filter, and ejecting out into the atmosphere (For a CO2 direct air capture application). However I want to start with ...
Prismatic_compass's user avatar
0 votes
1 answer
68 views

Scroll design for off the shelf tangential/cross flow fan rotor

I'm trying to figure out a somewhat optimized fan scroll shape for a cross flow fan rotor I aquired. However I seem to have vastly underestimated the complexity as I have a lot of trouble finding ...
tstdr's user avatar
  • 1
0 votes
1 answer
225 views

What is the purpose of springs in rotor's ventilator/fan

In my lawmower's motor plastic fan/ventilator on rotor has broken to few pieces There are 2 small springs in fan's slots. What is the purpose of these springs? Are there any standards for such ...
voldi's user avatar
  • 101
1 vote
2 answers
448 views

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 ...
J. Doe's user avatar
  • 111
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0 answers
73 views

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.
Abdulwali's user avatar
0 votes
1 answer
104 views

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 ...
nwsteg's user avatar
  • 169
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0 answers
92 views

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 ...
Snite's user avatar
  • 23
0 votes
1 answer
85 views

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 ...
user81993's user avatar
  • 153
1 vote
2 answers
507 views

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 ...
Yoshito Y's user avatar
0 votes
1 answer
105 views

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 ...
Cameron Roberts's user avatar
3 votes
1 answer
363 views

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 ...
am304's user avatar
  • 1,841
1 vote
1 answer
23 views

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.
Jordan McBain's user avatar