Joule-Thomson Effect

The Joule–Thomson effect describes the temperature change (increase or decrease) of a gas as it expands.

The change in temperature ($\Delta T$) with a decrease in pressure ($\Delta P$) at constant enthalpy (H) is known as the Joule–Thomson coefficient (μ$_{JT}$).

FluidFlow uses the Peng Robinson equation of state to calculate this coefficient, which is expressed as:

μ_{JT} = (\Delta T/ \Delta P)_H

The value of μ_{JT} is typically expressed in °C/bar and depends on the gas’s physical properties, temperature, and pressure before expansion.