Just something I came across, maybe posted before by me or someone, it's in English even though it starts out in French. I like the little box-like channel drawing where the air swirls. I want to try a duct with a lot of them, I read something once in Popular Science about multiple little "side streets" to obtain more power and mixing. I have some ribbed pipe that might work similarly.
Oops, I think it was in this article. In a rush before work, but there are some things in here that might be of interest too, rather long however.
http://www.microplumbers.com/pubs/Barde ... tation.pdf
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