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Vulpesveritas, on 16 February 2013 - 06:15 AM, said:
In all truth I must say I am disappointed Sen. I thought you understood the working of fans than that. The air volume is the same whether fans are in a single configuration or in push-pull, the only advantage in push-pull is the increase of static pressure, which reduces the creation of turbulence on the fins, and hence allows for heat to escape more efficiently. Therefore, it should be surprising that the X40, with it's 20% larger surface area, and the H100, with it's 60% larger surface area are not performing to the degree they should, unless the testing has improper airflow in the most likely instance of far too low external air pressure on the intake, or exceptionally high pressure towards the exhaust, of which the former is more likely in a standard room, with a case with a negative pressure fan setup.
Correct me if I'm wrong please, however as I see it Anandtech's bench seems more setup for testing stock fan air pressure capabilities more than cooling potential.
Correct me if I'm wrong please, however as I see it Anandtech's bench seems more setup for testing stock fan air pressure capabilities more than cooling potential.
Higher pressure difference will mean (slightly) higher flow. Turbulence is a good thing when it comes to heat transfer, that's why a push fan is always more effective compared to a pull.
Flow will not scale linearly with pressure drop because the drag increases with v^2. Lots of drag will mix up the air nicely (turbulence), which is important for metal-air heat transfer. So that's why it's often more important to look at pressure difference instead of flow.
On high performance coolers you'll see lots of fins with not much space in between, so lots of drag, so you'll have high pressure drop and good heat transfer, might be a bit noisy though. And if you put a silent fan on the flow will be too low, the air already being warm halfway through the fins. That's why silent coolers usually have lots of space between the fins, a low rpm fan can still create a good flow there and the travel time through the cooler is long enough to warm the air up even though there's little drag (drag mixes the air so the transfer metal->air is better).
Edited by Flapdrol, 16 February 2013 - 07:28 AM.
