Impinging vs. Cross - flows

[hobbes1526]

Just thought this was a little tidbit of info some of you could find useful.... I not so recently sat in a seminar at school and a well published thermo guy said that, while impinging fluid flows work very well for very localized (small spot) heat transfer, you need a high velocity to provide effective cooling... what this means is that if you're concerned with moving heat away from your source efficently *for old style heat sinks*, you need to have your fan blow across the heat sink and not down on it. :arrow: :arrow: :arrow:

 

[iain_lightbody]

I believe that's the driving purpose behind BTX style cooling units. Please someone correct me if I am off.

 

[DD_Jay_AZ]

He is correct.

Lightbody is correct as well.

I've ghetto-engineered my ATX system to do just that and have noticed a drop in temprature in the same ambient surroundings using the same CPU load cycle.

"Stealth" class fans are fun! Can use bunches of them to make air channels and ducts with neglible effect on sound.

 

[shawnlizzle =]]

impingent fluids is basically accelerating them at a high velocity then stopping and creating lots of turbulence... for example the swiftech storm blocks... i don't know what your talking about.

a reason for pointing the fan down is due to the fact that the current spreads over the mobo and helps cool the mobo down

 

[Clob]

With somthing like the xp-120 or the si-120 It wont matter since it uses heat pipes IMO.

 

[shawnlizzle =]]

it also depends on the fin orientation ie. your not hitting the fins sideways XD