Joule-Thomson Coefficient

by Daniel Gomez

Submitted : Spring 2010

When a gas is adiabatically expanded through a valve from high pressure to low pressure, its temperature may either increase or decrease, depending on the gas and conditions. This behavior is quantified by the Joule-Thomson coefficient. The curve on a temperature-pressure plot that separates regions where the Joule-Thomson has different signs is called the inversion line. In other words, this line separates the region from where a gas will increase in temperature (upon expansion) from the one where it will decrease in temperature and also represents the states for which the Joule Thomson coefficient is equal to zero. The goal of this project is to determine and plot the inversion line for carbon dioxide (CO2).

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