Which liquid metal is used in MHD?
Na-K is a good liquid metal because it has excellent properties and remains a liquid to below ambient temperature. It is compatible with many organlcs at low temperature.
Can liquid metal be magnetized?
By adding magnetic particles, such as nickel or iron, researchers can produce liquid metals that they can manipulate with magnets. However, because of their high surface tension, most magnetic liquid metals can only move horizontally, and they must be immersed completely in liquid to avoid forming a paste.
What does an MHD generator?
General Description of Thermal Power Plants The MHD generator or dynamo transforms thermal energy or kinetic energy directly into electricity. MHD generators are different from traditional electric generators in that they can operate at high temperatures without moving parts.
What is the working fluid in closed cycle MHD system?
The closed cycle MHD system may be either a plasma converter or a liquid metal converter. The plasma converter uses an ionized gas (helium or argon seeded with cesium) and the liquid metal converter uses the vapour of the metal or the metal in a liquid form (the metal may be an alkali or some other metal).
Can liquid mercury be magnetized?
At room temperature, the element mercury is not very magnetic at all. It has a very small, negative magnetic susceptibility, meaning that when you put mercury in a magnetic field, it magnetizes just a little tiny bit in the opposite direction. We say that mercury is a weakly diamagnetic substance at room temperature.
Is liquid aluminum magnetic?
Physicists have found that some liquid metals which appear to be non-magnetic — such as mercury, aluminium, gallium and lead — actually contain magnetic moments that appear and disappear on extremely short time scales.
What are the different types of MHD generators?
Basically, an MHD generator is a device for directly converting thermal energy into electricity. There are three types of MHD cycle: open, closed and liquid-metal.
Which type of gas is used in MHD generator?
The MHD generator uses hot conductive ionized gas (a plasma) as the moving conductor.
What is the working fluid of MHD?
As the name suggests the working fluid in a closed cycle MHD is circulated in a closed loop. Hence, in this case inert gas or liquid metal is used as the working fluid to transfer the heat.