One problem I have with the design is h(eff)
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Originally Posted by Incoherent
............The problem is to maintain a high convection coefficient.
This is done in this case, as Jabo suggested, by reducing the height of the block structure clearance. I've done this progressively radiating out from the inlet. At the outer edge of the block the clearance between block and middle cap is 0.5mm.
This maintains the water velocity down the slope of the sphere and thereby a reasonable convection coefficient. The structure I have not optimized at all, the
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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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Originally Posted by Incoherent
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The structure I have not optimized at all, the object was to test the concept.
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