Quote:
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Originally Posted by Marci
Half of the noise generated by a fan/rad combi is from the friction of air passing over the fins.
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Hmmm... now
there's something interesting to focus on. How exactly does airflow through fins translate to noise? Is the frequency proportional to the airspeed? If it is, what airspeed corresponds to "noise" under 15Hz or so (where normal humans can't hear it)? Or is there a relationship between airspeed and passage size (or even length)? I would
guess that noise is related to turbulence - and the downside of reducing turbulence would
probably be reducing efficiency-for-radiator-size and efficiency-for-airflow.
Just guessing here - feel free to slap me silly if you've answers rather than my not-very-useful questions...