The Joule Thomson Effect is the change in temperature that accompanies expansion of a gas without production of work or transfer of heat that often causes a temperature decrease as gas flows through pores of a reservoir to the wellbore. The phenomenon was investigated in 1852 by the British physicists James Prescott Joule and William Thomson (Lord Kelvin).
Reference Definition by Wikipedia: In thermodynamics, the Joule Thomson Effect (also known as the Joule–Kelvin effect, Kelvin–Joule effect, or Joule–Thomson expansion) describes the temperature change of a real gas or liquid (as differentiated from an ideal gas) when it is forced through a valve or porous plug while kept insulated so that no heat is exchanged with the environment. This procedure is called a throttling process or Joule–Thomson process. At room temperature, all gases except hydrogen, helium and neon cool upon expansion by the Joule–Thomson process; these three gases experience the same effect but only at lower temperatures.
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