Throttling process is an isoenthalpic process.$$U+PV=constant.$$ during throttling process does the gas do work at the cost of internal energy such that its temperature decreases? Then what is the difference between adiabatic and throttling process? Can we use throttling process to cool an ideal gas?
An adiabatic throttling process is irreversible, and the internal energy of the gas in such a process typically does not significantly decrease. Any expansion cooling effect of the gas is compensated by irreversible viscous frictional dissipation (heat generation) within the throttling plug or valve. So, for an ideal gas, there is no change in internal energy and no change in temperature. For real gases, there is a very small effect resulting from non-ideal gas behavior.