I see two 'problems' with this design.
The highest heat transfer coefficient is likely 'wasted' where the water first strikes the copper beads, at the top layer. By the time the water hits the bottom plate, it will likely have slowed a great deal, decreasing turbulence and the good heat transfer characteristics that come with it.
My second point, which explains why I said 'wasted' in the first paragraph, is that by only having (in theory) point contact between the beads this will make for horrible heat transfer from the base block up to the top of the beads.
Of course my first point may be totally wrong and my second point depends on the manufacturing process, the number and size of beads, etc...
Interesting idea still.
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