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It helps to think of air as a gelatinous fluid. It will act like a semi-solid if you get it fast enough and will bounce off objects you want it to pass through. My jeep for instance displaces so much air at highway speed that it stops moving through my radiator.Not to get off topic, but the bottom line is I have tried these setups myself with Dynatron server heatsinks, and without dams to force the pressure through the fins it usually doesn't do nearly as good of a job as a smaller, noiser fan right over the blades.It's a tradeoff with small form factor as you want to cool as many components as possible with one fan. You need to find the balance between a low restrictive heatsink and enough pressure from the fan.Peace!
It helps to think of air as a gelatinous fluid. It will act like a semi-solid if you get it fast enough and will bounce off objects you want it to pass through. My jeep for instance displaces so much air at highway speed that it stops moving through my radiator.
Not to get off topic, but the bottom line is I have tried these setups myself with Dynatron server heatsinks, and without dams to force the pressure through the fins it usually doesn't do nearly as good of a job as a smaller, noiser fan right over the blades.
It's a tradeoff with small form factor as you want to cool as many components as possible with one fan. You need to find the balance between a low restrictive heatsink and enough pressure from the fan.
Peace!
