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Magnetohydrodynamics - Propelling Liquid Metal with Magnets!

Tech Ingredients2 HN recommenders · 2018–2023
1.1M views · explainer · evergreen · Uploaded 2018-07-26

Tech Ingredients explains the principles of magnetohydrodynamics and builds several demonstrations, including propelling liquid metal and electrolytes with magnets and a railgun-style setup.

It comes up as a great explainer on magnetohydrodynamic drives and pumps in threads about silent submarine propulsion.

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3 comments from Hacker News

@macromaniac2018 · in “Magnetic Field Record Set with a Bang: 1,200 Tesla”

If can get to 4 billion tesla I /think/ that's enough to generate electrons from the vacuum of space (see:schwinger magnetic induction) and you could do something akin to magnetohydrodynamics ( see: [VIDEO] ) which would use the magnetic field to accelerate the electrons away from the ship, I could be incorrect here though

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@bloudermilk2020 · in “The propeller is giving way to the pump-jet propulsor on larger submarines”

There's a great video from one of my favorite YouTube channels about Magnetohydrodynamic drives. Really fascinating drive design and channel for anyone interested in engineering. [VIDEO]

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@elihu2023 · in “Taking a New Look at Fundamental Tech for Quiet Undersea Propulsion”

Interesting. If I understand correctly, they need a electrode that's in physical contact with the sea water. I'm not sure I understand it entirely, but there's a video on the Tech Ingredients channel that explains magnetohydrodynamic pumps: [VIDEO]

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