Faraday’s law and voltage generation

[JimH59]

If a conductor moving through a magnetic field generates an emf, which it does, COULD a highly conductive liquid (eg: sea water) moving through said field (like a magnetic flowmeter measuring flow rate is used) generate and would it be enough to be useful?

 

[Borek]

https://patents.google.com/patent/US4151423A/en

"Useful" is the hard part, as far as I am aware nobody implemented anything practical yet.

 

[BillTre]

There is a different, but closely related situation (magnetohydrodynamic drive or MHD accelerator), where magnetic fields are used to propel ships with no moving parts:

Some one who knows more about this stuff could give a better explanation of this than I could.

The Russian sub in "The Hunt for Red October" was supposed to be powered by something like a magneto-drive.

 

[tech99]

There is a speedometer for vessels using the principle you describe.
https://www.nasamarine.com/product/clipper-electromagnetic-speed-log/