a really interesting and informative thread!
I have an idea that could suggest something more to a guy involved in this stuff: what really interest us is not turbulence as such but thoroughly mixing water and having the thinnest posible boundary layer. I've thought of a kind of "ordered turbulence" having vortexes the size and orientation you want and where you want them.
Mostly I thought about a hard disk cooler but that could be used for other blocks; in this case I would use triangle cross section fins parallel to flow and between them short fins at 45º to flow to make water spin. the small fins would go one direction in one row and at 90ºdegrees in the next row so where vortexes touch they would have the same flow direction. (i'll post a drawing later i have to go to work now).
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