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Old 03-18-2007, 10:54 PM   #5
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Originally Posted by madmat View Post
There's a difference between the moving stator in a turbine and the fixed horizontal fins of a HSF. You might take exception with his statement but it is nonetheless true. The higher the fin count and the higher the fin density the lower the flow due to resistance to air flow. A moving stator acts as a compressor by forcing air through the fins due to shear caused by the motion of the stator and forward motion of the motor through the air. The fins in a heatsink don't move and there is no forward motion to help force the air through them. Instead you have a motionless layer of metal with X fin density comprised of fins of Y thickness with air being forced through it by a fan (Z) with a a rating of so many mm of H20 displacement. It's still based on fluid dynamics only the heatsink is the baffle behind the compressor rather than the compressor itself.
Actually my jet engine experience is on naval vessels used for propulsion and power generation, not in airplanes. Neither moves forward in a current of air, they sit in large boxes in the belly of a ship. If you think you're right then put it to the test.
I'll put up $20 that says I'm right.
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