fivemack (fivemack) wrote,

Today's piece of forty-year-old engineering lunacy

is a design for a heat exchanger, from the primary sodium-potassium-eutectic coolant loop of a space-based nuclear reactor to the secondary mercury coolant loop. Not quite the chemical fun of a liquid-sodium/water heat exchanger, but I think sodium and potassium both dissolve enthusiastically in mercury to produce amalgams combining the toxicity and gets-everywhere of mercury with the violent reactivity with everything of the alkali metals.

See for more examples of the lure of boiling mercury to power-station designers; it seems to be a very appealing improvement on normal superheated steam, at least if you're not too concerned about expense, weight or neurotoxicity.

In a similar vein, talks at length about a variety of designs for steam engines with liquid-metal pistons, dating all the way back to James Watt. You have the choice between mercury, which is not good for kittens and other living things, or bismuth/tin-based alloys, which solidify when the steam-engine is turned off, and sometimes expand enough to burst the engine.
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