- Throttles enable an unresisted
expansion of the working fluid flowing through them.
Because there is no resistance, there is no work done,
and hence no change in enthalpy. The behavior of a fluid
flowing across a throttle depends on its Joule-Thompson
coefficient and whether it is above or below its
inversion point. A fluid above the inversion point will
experience an increase in temperature, while one below
the inversion point will drop in temperature. A gas
passing through a throttle may precipitate into liquid,
while a liquid may suddenly vaporize, creating a
refrigerating effect as it absorbs heat from its
environment to sustain the evaporation process.
- Possible modeling assumptions for