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Results tagged with fan
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user 40292
The fan is an electrical appliance using the principles of a motor.
3
votes
Why are the blades of a pedestal fan so different from the blades on an aircraft propeller?
A fan designed for use in the home must be much quieter in operation than a fan that is designed for maximum propulsive efficiency. … This also makes the fan quieter. …
- 97.8k
0
votes
What factors determine the suction of an exhaust fan?
A good guide to fan effectiveness in general is fan power which is the current draw times the voltage when running at the fan's rated speed. … Since fan noise is produced by the fan blades, artful design of the blades is necessary to minimize noise. …
- 97.8k
0
votes
Accepted
Comparison of 2 fans
Poor design of the blade shape will cause more useless churning of the air and greater noise generation. Better design will cause less churn, less noise, and better power transfer from the motor to th …
- 97.8k
2
votes
Why does the car move faster?
This is why helicopters hovering close to the ground in ground effect require less power to do so than when they are hovering high off the ground. A "bubble" of compressed air piles up in the space be …
- 97.8k
175
votes
Accepted
Why do fans spin backwards slightly after they (should) stop?
You can demonstrate this yourself by carefully rotating the fan blade around with your finger when the motor is off. … You will notice there are certain rotation angles where the fan wants to come to rest and others which it wants to avoid. …
- 97.8k
4
votes
Accepted
Why does a running fan causes some soundproofing in the room?
this is an effect called masking, in which the random noise of the fan raises the overall noise floor in your room. …
- 97.8k
3
votes
Accepted
Why does a running fan produces some sound?
As a fan blade moves through the air, it pushes a pulse of air away from the fan and towards you. You perceive this as a single pulse of "whump" sound. … Because of the greater surface area of an overlapping fan disc, it will experience more friction with the air and therefore exhibit lower efficiency than a (far noisier) fan with slender blades that have …
- 97.8k
1
vote
Could an electric centrifugal fan in space be used to propel a substance to create force?
Point #1 is indeed how any "reaction motor" operates, including the small rocket thrusters normally used to do this.
Point #2 is ruled out by conservation of momentum: there is no way to make a "rea …
- 97.8k
0
votes
Conversion between Power and Flow rate of Fan taking into consideration the geometry of the fan
the power delivered by the fan blades to the air moving through it will be equal to the mass flow rate of air through the fan times the pressure difference across the fan. it will also be equal to the … power delivered by the motor times the efficiency of the fan. …
- 97.8k
0
votes
why shadow of a glass oscillates under the rotating fan behind which there is a lightsource
If the light blink frequency and the fan blade speed were constant, why then would the blade strobing effect wobble back and forth? … If the fan is suspended from the ceiling on a rod mount, then the whole fan assembly will wobble around in a small circle as the out-of-balance blades rotate. when you combine the wobble with the blade …
- 97.8k