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Fan Adapters, Speculation on bad pressure?

D

DDsD

Junior Member
Damn i forget what site i was on but basically they were reviewing a bunch of 60mm to XXmm fan adapters, and when using the adapters with the fan blowing down into the heatsink they actually performed worse than the 60mm Delta despite havibng a higher rated CFM. But when the fans were sucking air away from the heatsink they were more effecient than the 60mm Delta, Any speculation on why this would be the case, any Fluid dynamics majors out there witha reason why the low air pressure behind the fan would hinder the fan less than the high air pressure in fron of the fan? wouldnt it be in a similar ratio anyway?
 
I asked a similar question earlier and someone posted this link Just look at the pics.

The important part is near the very end of the page so be patient
 
Lucky the pictures say a thousand words, im a lil rusty on the chinese 🙂 so basically their is a build up of pressure inside the adapter which attempts to reflow thoguth the fans themseves, but i would have thought that this pressure would simply be released through the small opening within the fan adapter, to an extent anyway?

Or is it simply the turbulance created by this system? in which case would it not be impossible to redesign the adapter so as to eliminate this turbulance?
 
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