Thermal barriers is a problem here, just like cooling a heatpipe with water. Heat slows down when it is transferred from one material to another.
If you are going to cool liquid metal with water... what's the point of containing the liquid metal in the block? It just doesn't seem efficient to me. For a system of this complexity and cost, jet impingement would probably offer better performance.
Why not just have a liquid metal coolant loop with a larger radiator? Personally I'd like to experiment with liquid metal. It could potentially eliminate a very expensive part of watercooling: the pump.
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