All right. It turns out that Kryotherm has this calculation already, and that the dynamic viscosity (which is labelled kinematic viscosity) of water at 20 deg C = 1.006 E-6. At 30, it's .805 E-6 .
The thermal conductivity W/(m*K):
Water@20: 0.599
Water@30: 0.618
That's for a flow rate of 1 m^3/hr (264.2 U.S. gallons/hour).
Reynolds comes out at 15279, for a heatsink (cooled by water at 20 deg C), where the "forcer mounting" (whatever that is) is set to "on the top of the heat exchanger". The other option is too fuzzy, I'll have to read the help file. Heatsink is roughly the area of the first set of fins, before fin set#2, so fin width = 1.5 mm, channel width (I averaged between 1.0 and 2.0) to 1.5, length = 5 (from radius = 2.5 mm). Copper Thermal conductivity adjusted to 391 W/(m*K).
The resulting "Heat Exchanger thermal resistance" (K/W) = 0.420 .
Those are preliminary numbers. I'm just playing with Kryotesc today.
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