I think you are right, its probably some metamaterial like shark skin, where the surface of the exchanger itself is designed to prevent frost crystallization from occurring .. i.e. the metamaterial is geared towards the properties of water at the stage where it goes from fluidic to crystal .. I forget the term .. so the structure of the surface of the exchanger is formed such as to demote crystallization long enough for the pressure forces to remove the liquid hydrogen ..
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My first thought was a metamaterial.
Something like this, I suspect: http://www.sharklet.com/technology/
I think you are right, its probably some metamaterial like shark skin, where the surface of the exchanger itself is designed to prevent frost crystallization from occurring .. i.e. the metamaterial is geared towards the properties of water at the stage where it goes from fluidic to crystal .. I forget the term .. so the structure of the surface of the exchanger is formed such as to demote crystallization long enough for the pressure forces to remove the liquid hydrogen ..