" A problem with most heat sink/ fans is that the fan blows air into the heat sink fins, but it has nowhere to go once it hits the bottom of the heat sink. The air scatters and creates turbulence while trying to escape through the sides."
This isn't always a bad thing, 
check out the YS Tech fan on this puppy.
Related Web URL: http://www.thetechlounge.com/review.php?REVIEWDIR=...
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