The Magnetohydrodynamic Generator
MHDs are generators which use conducting fluids (such as plasma and salt water) instead of solid ones. Such a conductor can be obtained by burning fossil fuel under high pressure. These generators do not affect the environment and were developed to heat the boilers of a steam power plant as they have the high thermal efficiency which conventional electric generators do not.
For those interested in the particulars, the principle of this type of generator is the Lorentz Force Law:
F = Q • (v × B), where F = Force acting on the particle, Q = Charge on the particle, v = Velocity of the particle, B = Magnetic field. Just remember that the direction of the force vector is perpendicular to the plane of velocity and magnetic field. And with the contribution of the Navier-Stokes equation and Maxwell’s Law of Electromagnetism, studying the electrohydrodynamic generator becomes possible.
There are many MHD designs – the disc generator, the Faraday generator and the Hall generator. A simple model contains combustion chamber, generally called a gas nozzle. The nozzle injects gas at a high speed (1000-2000 m/s) into the duct or channel where a strong magnetic flied (usually 3 to 5 Tesla) is active with the help of superconducting magnets. As the gas passes through it, an electric field is produced because the fluid moves constantly while the electromagnets are stationary. The current is then transported through an external circuit.
In conclusion, the channel or duct acts as an electrode, acting as a connector to the external circuit.
|conducting fluids, disc generator, Faraday generator, Hall generator, Lorentz Force Law, steam power plant, superconducting magnets|