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Didn't realise that windmill blades are serrated
(lemmy.world)
A friendly place to chat.
No politics please. Don't be a dick.
They disrupt the trailing edge eddies - which is what causes any noise - and so make them quieter. They are often fitted in areas where sound might be a particular issue.
So why don't my CPU/case fans have serrated edges as well? Because they are too small?
Some do, e.g. Noctua: https://noctua.at/en/vortex-control-notches