A specific type of adiabatic process of fluid transportation due to the pressure drop under constant enthalpy
{\displaystyle H}= \rm const.
Throttling is a fundamentally irreversible process.
The throttling process entails a specific temperature effects, either warming or cooling.
The most popular throttling processes are fluid flow through the orifice and percolation through porous medium.
See also
Physics / Thermodynamics / Thermodynamic process / Adiabatic Process
[ Throttling temperature effect ]