Blade Fan
What’s more important in the mechanics of a fan blade? Speed, (RPMs) or the angle and/or curvature?
Also, I was wondering how exactly a fan blade does its job- does it catch the air, does it create a vacuum effect, pulling the air forward, what exactly is that piece of plastic doing to move those air molecules? Does it work on the same principle of an airplane’s wing?
ALSO: If the temperature is the average kinetic energy, why does the air feel COOLER when it is moving FASTER than the air around it? Is it that the air flow is absorbing the heat energy, and more air is coming to absorb more?
Oh yeah- If one is designing a fan blade, how should the air move around the blade when it is in a static position, shown withh a small wind tunnel?
Bibs, yes I have, on account of I designed both the wind tunnel i will attept to use and i am attempting to design a fan, since its so hot and it seems no fan is powerful enough. (because it’s blowing air that is about 99 degrees) But there’s a problem with getting that degree- still in high school
A fan isn’t that complicated. It’s just swinging a bat at air molecules to impart kinetic energy to them in a preferred direction. The Bernoulli effect doesn’t play much of a part. As you send air molecules away, you locally reduce the air pressure, and surrounding air at higher pressure moves in to move toward equilibrium.
Fans are designed for various purposes with various criteria. A room fan just tries to move the air efficiently with minimum noise. Blade angle, shape, and speed are just design parameters traded off.
Air from a fan feels cooler if it’s bringing you air that’s cooler than the air that’s currently around you, and because it increases the rate of evaporation of your perspiration. Fans are most effective if they can carry warmer air out of a room, to be replaced by cooler air from somewhere else.
Blade Fan Freakout
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