ok, still about the case i'm planning:
i'm thinking of using damping foam for controlling the airflow inside the case. figured it'll have double uses then. plastic/paper/metallic devices would just steer the airflow, not help out.
question is though, is it really a good idea or will the foam hamper airflow too much?
reagrds, kent.
foam for controlling airflow?
Moderators: NeilBlanchard, Ralf Hutter, sthayashi, Devonavar
My theoretical 2 cents: foam has more friction at its surface than smooth cardboard, plastic etc. For low-airflow situations and/or narrow ducts this might become an issue, where the foam restricts air flowing through more than a smooth surface would. Therefore I tend to use a combination: a smooth surface that the airflow "hits" first, backed up with foam to dampen the noise. OTOH, my first PSU duct was made out of very rigid plastic (from air conduit parts that are used in ventilation systems) and it made one hell of a natural amplifier... so too rigid is not good either.
But then again, I might simply be totally off...
Oh, and I've never spent a lot on dampening stuff: I have a left-over roll of floor vinyl (~3x3 meters) + roofers tape for mass dampening and lots of eggcrate foam from server packaging at work for the higher frequencies.
But then again, I might simply be totally off...
Oh, and I've never spent a lot on dampening stuff: I have a left-over roll of floor vinyl (~3x3 meters) + roofers tape for mass dampening and lots of eggcrate foam from server packaging at work for the higher frequencies.
my fears exctly... but your ideas on a two-compound combined with mikec's, a thin-ish layer of closed cell foam to direct the air (will still "scatter" it a bit though) and then the good stuff behind that.teejay wrote:My theoretical 2 cents: foam has more friction at its surface than smooth cardboard, plastic etc. For low-airflow situations and/or narrow ducts this might become an issue, where the foam restricts air flowing through more than a smooth surface would. Therefore I tend to use a combination: a smooth surface that the airflow "hits" first, backed up with foam to
good point! i hadn't even thought of that. so i guess if i should use for example plastic i should cover the back of it in some sort of vinyl or foam to kill off vibration then?teejay wrote: dampen the noise. OTOH, my first PSU duct was made out of very rigid plastic (from air conduit parts that are used in ventilation systems) and it made one hell of a natural amplifier... so too rigid is not good either.
thanks you guys, if my case is a success i owe it to spcr bigtime!