Yea but how does it do both? I'm not talking perspective. I'm talking the mechanics of the fan. How does it suck then blow? (Please no "thats what she saids"
So does it suck or blow? It can't do both at the same time.
Why not? You can't have one without the other in that type of design. An airplane wing creates high pressure on one side, low pressure on the other. A vacuum cleaner creates high on one side (exhaust) and low on the other (intake). It does both.
[This message has been edited by Rainman (edited 09-04-2009).]
So does it suck or blow? It can't do both at the same time.
Then it would be a sucker. It’s moving air from one place to another, its directly affecting the air it’s moving by sucking it from one place to another. The blowing is a side effect of the air being displaced by the Sucked air
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06:42 AM
grkboy707 Member
Posts: 3019 From: Kingsville, MD Registered: May 2009
A: An electric fan is an electric motor with a fan blade attached to the rotating shaft. As the motor spins, the fan blades rotate. Each blade is inclined a bit, and as the inclined plane of the blade moves through the air, it forces the air ahead of it forward. Each blade does this on a continous basis, and the result is a moving air stream. The fan is taking air (Sucking) from the area behind itself and blowing it out the front. The fan generates a movement of air, causeing the warm, less dense air to rise, and the cool, dense air to descend. Thus the coolness now in the air.
So does it suck or blow? It can't do both at the same time.
It can't do one without the other.
A motor boat propeller moves water in front of the blades to produce thrust. A fan is producing thrust. Just like the boat propeller, the fan is moving air from one side to the other.
Would a fan work/blow in a vacuum? No.
Look at it this way, the fan blades are surrounded by air, the blades are moving air.
Ron
[This message has been edited by blackrams (edited 09-04-2009).]
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08:00 AM
2.5 Member
Posts: 43235 From: Southern MN Registered: May 2007
So does it suck or blow? It can't do both at the same time.
It does do both.
Depends on thich way it is facing, if you are thinking about the item it is cooling. Look at cars with electric radiator fans, if it is in front of the radiator it is blowing on it. If it is on the engine side (or behind the radiator) it is sucking air from the radiator.
Either way, say you removed the radiator entirely. It is actually doing both.
Or look at a ceiling fan, if it its blowing air down, it is sucking it from the ceiling area.
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08:15 AM
Patrick's Dad Member
Posts: 5154 From: Weymouth MA USA Registered: Feb 2000
Then it would be a sucker. It’s moving air from one place to another, its directly affecting the air it’s moving by sucking it from one place to another. The blowing is a side effect of the air being displaced by the Sucked air
No, it's a blower. The sucking is a side effect of the air replacing that being forced by the blower.
It depends on which side of the radiator it is. In a Fiero it is behind the radiator, so it is a puller or sucking fan. It pulls air through the radiator. If it where in front, it would be called a pusher, because it would have to push air through the radiator.
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09:57 AM
PFF
System Bot
jimbolaya Member
Posts: 10652 From: Virginia Beach, Virginia Registered: Feb 2007
but, I am gonna agree with "it blows", and the "suck" is a side effect of the vacuum left behind by the "blown" air and, to expand on this - think "propellor" or even a helicopter rotor.
In physics terms, the fan creates a directional force that acts upon the air. In the physics math, the concepts of "sucking" and "blowing" are basically irrelevant. It's a net force acting in a certain direction.
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11:34 AM
82-T/A [At Work] Member
Posts: 25696 From: Florida USA Registered: Aug 2002
Yea but how does it do both? I'm not talking perspective. I'm talking the mechanics of the fan. How does it suck then blow? (Please no "thats what she saids"
Well, the flat part of the fan pushes (displaces) air away from it (the pushing part). The way pressure in our atmosphere works... the void caused by the displaced air gets replaced by more air (the sucking part).
I'm sure someone will get all nerdy and get upset and say that I'm not using scientific enough terms, at which point they'll talk about their engineering degree they got in the 70s and how they saved the world with their vast understanding of flow dymanics or whatever... but that's basically the gist of it.
A fan sucks and blows. The design of the blades pulls air from on side and slightly compresses it (or higly compresses it depending on the design, number of blades, number of stages, and purpose. The New GE CF6-6 Turbo fan engine has two stages of fans on it that comprises a single stage fan, with one core booster stage, driven by a 5-stage LP (low pressure) turbine, supercharging a 16-stage HP (high pressure) axial compressor. Therefor it suck and blows as the video below shows with the vorticies seen while running and the thrust coming out the rear of the engine.
Shelby
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01:37 PM
johnt671 Member
Posts: 2271 From: sugarloaf pa usa Registered: Feb 2001
What are you saying? Philly's fans SUCK and Met's fans BLOW or vise versa? Or could it be both? What is the case during a solar eclipse? Does the time of year have anything to do with it? Maybe it has something to do with solar flares or the jet stream?
There's only one way to get an answer. Let's roll one and come to a conclusion!
[This message has been edited by katatak (edited 09-04-2009).]
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02:43 PM
Boostdreamer Member
Posts: 7175 From: Kingsport, Tennessee USA Registered: Jun 2007
I'm sure someone will get all nerdy and get upset and say that I'm not using scientific enough terms, at which point they'll talk about their engineering degree they got in the 70s and how they saved the world with their vast understanding of flow dymanics or whatever...
Originally posted by Synthesis: It won't be. But asking a question such as "Does a fan suck or blow" is akin to asking whether a lamp is giving off light or sucking dark...
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12:37 AM
Formula88 Member
Posts: 53788 From: Raleigh NC Registered: Jan 2001
This fan sucks. Retails 270. I sell it for 200 even.
It has extremely tight clearances providing the ability to build pressure with out much loss. It can pull or suck making it useful for pulling air through a charcoal filter. Retails 290. I sell for 225.
This fan blows Retail 185 I sell for 140. This does not have very tight clearance and just needs to move air through generally unobstructed tubing or lights like these. Retail 105. I sell for 85.
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01:28 AM
FriendGregory Member
Posts: 4833 From: Palo Alto, CA, USA Registered: Jan 2004
Some of these fans have a reverse switch, So the question is no longer "Does a fan suck or blow". With a flip of the switch it becomes "Does a fan blow or suck"
