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Originally Posted by Les
One problem I have with the design is h(eff)
With no furniture and flow@4LPM this, according to Kryotherm, equates to h(conv)=h(eff)=7547.6 w/m^2*c
Remaining about the same at 12.5mm radius with 0.65mm channel height
Introduction of 20 1.4mm Fins at 8.5mm radius and 1mm channel height gives h(conv)=14262.4 w/m^2*c and h(eff)=28495.7w/m^2*c
Apologise for the messy sums, but I hope it conveys the point that I am not convinced a high h(eff) is maintained.
However did note:-
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It must also be said that as one moves further away from the center that water velocity will drop quite rapidly unless the clearances are progressively altered, such as fitting a parabolic bowl atop the hemisphere.
Alternately, using 1mm cutters, one could form, say, a 12mm diameter pin grid on top and implement 4 or 6 channel that radiate out and descend, giving a constant mini-channel water velocity when the hemisphere is capped. In this instance, would probably want to make the hemisphere around a 15mm radius and carve 4mm deep channels/pins into it. Truly something that would require a full 3D CAD model, and a fair amount of trig. to accomplish.