Joule Thomson Effect

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Joule Thomson Effect

The decrease in temperature which takes place when a gas expands through a throttling device as a nozzle. Also called Joule-Kelvin effect. </dd>
The rate of change of temperature T with pressure p in the Joule-Thomson effect is called the Joule-Thomson coefficient (symbol μ):

Missing Image:img src="SP7_j_files/joule.gif" alt="joule symbol"
where h denotes constant enthalpy. For the

Joule-Thomson effect to take place the gas must initially be below its inversion temperature; if above the inversion temperature, the gas will gain heat on expansion. The inversion temperature of hydrogen, for example, is approximately -183 degrees C. </dd>


This article is based on NASA's Dictionary of Technical Terms for Aerospace Use