Synonym: Throttling Temperature effect = Joule–Thomson effect

Temperature change of a fluid (except ideal gas) when it is forced through a valve or percolating through porous medium while keeping it insulated so that no heat is exchanged with the environment (that is, at constant enthalpy $\begin{array}{l}{\displaystyle H}= \rm const\end{array}$ ).

The value of temperature effect $\begin{array}{l}\Delta T\end{array}$ is proportional to pressure drop $\begin{array}{l}\Delta P\end{array}$ :

(1)	$\begin{array}{l}\displaystyle \Delta T = \epsilon_{JT} \cdot \Delta P\end{array}$

where

$\begin{array}{l}\epsilon_{JT}\end{array}$

is Joule–Thomson coefficient

There are two major types of throttling temperature effects:

Orrifice Throttling Temperature @model

Percolation Throttling Temperature @model

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See also