On Sun, 2 Feb 2003, Randall Clague wrote:
> For film cooling, I don't see the benefit of letting the incoming air
> heat the skin, and then cooling the skin. Why not just cool the
> incoming air?
Because not all the heat you are removing from the incoming air would
have gone into the skin. You'll use more coolant that way.
Cooling the skin amounts to cooling a very thin boundary layer of air
completely, and layers above that progressively less so. Cooling the air
itself will be a less orderly process with a thicker layer of
completely-cooled air.
This may be a worthwhile tradeoff, but there is a cost.
Henry Spencer
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