i just woke up and i looked at my electric fan...and noticed a lot of dust had accumulated on the fan...anyone haf any idea y? shouldn't the wind generated from the fan blow the dust away?
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Originally posted by Evil
you mean the air at the blade is still? wow... can u elaborate more on the fluid mechanics 101 and the zero-velocity boundary layer part?
The wind generated from the fan is not strong enough to overcome the force of gravity on the dust particles. The fan may provide some air movement, but it is not powerful enough to lift the dust off the surface.
The direction of the fan can make a difference in how effective it is at blowing dust away. If the fan is blowing in the same direction as the dust is settling, it may not have much impact. However, if the fan is blowing in the opposite direction, it may be able to push the dust away.
A stronger fan may be more effective at blowing away dust, but it still may not be able to completely remove all of the dust particles. Additionally, using a very strong fan may create other issues, such as causing objects to move or creating too much air flow in a room.
Yes, dust particles are constantly in motion due to air currents and gravity. When the fan is turned off, the dust will eventually settle back down onto surfaces.
Using a fan may provide some temporary relief, but the most effective way to remove dust from a room is to regularly dust surfaces with a damp cloth or use a vacuum with a HEPA filter. Keeping the room clean and using an air purifier can also help to reduce dust levels.