Chemical Engineering Thermodynamics
The adiabatic throttling process of a perfect gas is one of constant enthalpy

In which there is a temperature drop
In which there is an increase in temperature
Which is exemplified by a non-steady flow expansion
Which can be performed in a pipe with a constriction

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Chemical Engineering Thermodynamics
It is desired to bring about a certain change in the state of a system by performing work on the system under adiabatic conditions.

The amount of work needed is path dependent
More information is needed to conclude anything about the path dependence or otherwise of the work needed
Work alone can not bring out such a change of state
The amount of work needed is independent of path

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