How do ceiling fans collect dust when they’re constantly in motion?
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In addition to static charge. There are oils in the air, predominantly from cooking. Aerodynamically, the micro thin layer of air at the surface of the blade is static – it adheres to the blade and has no relative velocity. If dust finds its way into this layer, it adheres via static charge or aerosol oil.
Have you ever noticed when you drive roughly 3 car lengths behind a semi truck you can catch the air stream/draft that will slightly pull you towards the truck making your fuel efficiency very efficient?
This is similar to what’s happening on the fan blades when spinning around. There’s a draft that starts at the front direction edge of the fan blade pulling the air down onto the blades combined with warm air, moisture and lastly dust to stick to it.
So between fan blades pulling the air down creating the environment for dust to be collected there and the fact that the fan blades are spinning thus traveling more than a stationary piece of furniture that collects far less dust.
Just bc they are in motion doesn’t mean they can’t collect dust. The fact that they are in motion means they contact even more dusty air than say a counter top in a room with poor circulation.
We could go on to talk about boundary layers or static charges but the real reason is that it’s a surface that dust can stick to so it does. And it high up so it get cleaned rarely.
You leave your ceiling fan going 24/7?
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