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? shouldnt the wind generated from the fan blow the dust away?
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Yep, on a microscopic level. You wouldn't notice unless you're particle-sized. Consider flow through a pipe. The flow is fastest through the middle and slower toward the edges where there is more friction.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?