15-04-2017, 02:39 PM
The nozzle is a conduit through which flows through which the velocity of a fluid increases at the expense of the pressure drop. If the fluid is steam, then the nozzle is called a steam nozzle.
The steam flow through the nozzles can be adenobatic expansion takenas. The steam has a very high velocity at the end of the expansion, and the enthalpy decreases as the expansion occurs. There is friction between the steam and the sides of the nozzle; Heat is produced as a result of resistance to flow. The phenomenon of super saturation occurs in the flow of steam through the nozzles. This is due to the time delay in the condensation of the steam during the expansion.
The area of said conduit having a minimum cross-section is referred to as a throat.
A fluid is called compressible if its density changes with the pressure change caused by the flow.
If the density changes very little or does not change, the fluid is said to be incompressible. In general, gases and vapours are compressible, while liquids are incompressible.
Types of nozzles:
There are three types of nozzles
1. Converging nozzle
2. Divergent nozzle
3. Convergent divergent nozzle.