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.

[–] Trail@kbin.social 2 points 1 year ago (2 children)

So why don't my CPU/case fans have serrated edges as well? Because they are too small?

[–] GreyShack@lemmy.world 4 points 1 year ago (1 children)

Because they are too small?

Could be. As is said so often: physics doesn't scale. Trailing edge eddies may not be the major source of the noise in this anyway - since these are pushing air not being pushed by it.

[–] Trail@kbin.social 3 points 1 year ago

Yeah that makes sense I guess.

[–] Siamanguel@lemmy.world 3 points 1 year ago

Some do, e.g. Noctua: https://noctua.at/en/vortex-control-notches

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