Do shrouds helps increase static pressure?

As far as i know the shrouds are to increase airflow to the dead spot. This is the part directly in the middle of the fan where there are no fins to create airflow, so a shroud provides room for the airflow to expand into this area. (probably terribly explained, hope you can understand what I'm trying to say :))
 
Reaper652 said:
As far as i know the shrouds are to increase airflow to the dead spot. This is the part directly in the middle of the fan where there are no fins to create airflow, so a shroud provides room for the airflow to expand into this area. (probably terribly explained, hope you can understand what I'm trying to say :))
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Thats exactly what they are used for. To elevate the dead spot caused by the center of the fan, when the fan is to close to heatsink/radiator, moving it back with a shroud gets rid of said dead spot.
 
Shrouds can also reduce noise created by turbulence as the air passes through a restriction.

It will not increase static pressure, only adding more speed or an additional fan will do that.
 
Afaik static pressure is the pressure at a nominated point in the fluid. So you're staring at one point and repeatedly measuring the pressure there. As a rating for fans, I imagine it's the pressure developed a specified distance downstream of the fan.

Adding a shroud decreases the resistance to airflow, so more air moves through the system. It also homogenises the airflow somewhat, so the airflow through the radiator is more uniform. Either effect would improve water temperatures, wouldn't like to guess which effect is the important one.

I *think* the pressure downstream of the fan would actually be lowered by adding a shroud.
 
Hey there thanks for the replies. The main reason I care about static pressure is because I plan to build a radiator sandwich with 4 triple rads. At the moment the plan is 38mm yate loons.
 
The latter :p

I ended up getting cheap 2nd hand rads in the end. Atm im cooling an i7 920 at 4.2-4.3 ghz, a r2e and a 4870 x2. I plan to get the new ati/nvidia series cards whenever they come out. Most probably the 2 6970's if that will exist and I also plan to cool the ram just for aesthetics. I figured 4 rads will help cool all these while still keeping low rpms as im a silent freak :p O how I love student loans and interest free overdraft :)
 
Also I need a sandwhich as I wont then need to make an external enclosure and 4 triples vertically one on top of the each other means more fans are needed (24 as opposed to 15) gets to be about 500mm is too much for me.
 
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