Find Answer: How Does a Fan Work?

[aberrated]

can anybody help me to find the answer of this question?

a fan ( or a propellor) rotates sidewise, but the air goes making a perpendicular with the axis of its motion.. I know that there is vector involved in this, but how does it work?

 

[pseudovector]

Normal forces are perpendicular to the surface, so whenever a fan wing hits a molecule, it accelerates it in the direction perpendicular to the plane of the wing.

 

[ken]

So there is a slight hellical rotation in the fan airstream which is generally ignored.

Ken

 

[fatra2]

The twist in the fan's "arm" make the air change direction when moving. This change of direction creates a reaction on the fan itself. This reaction acts as a force on the whole device.

If you want, the process is the same as for planes flying. The air passing under the wing of the plane is deviated downward, creating a force upward on the wing.