Joule-Thomson effect

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The Joule-Thomson effect is also known as the Joule-Kelvin effect. This effect is present in non ideal gasses, where a change in temperature occurs upon expansion.

[edit] Joule-Thomson coefficient

The Joule-Thomson coefficient is given by

where T is the temperature, p is the pressure and H is the enthalpy.

In terms of heat capacities one has

and

In terms of the second virial coefficient at zero pressure one has

[edit] Inversion temperature

^{[1] [2]}

[edit] References

1. ↑ Jacques-Olivier Goussard and Bernard Roulet "Free expansion for real gases", American Journal of Physics 61 pp. 845-848 (1993)
2. ↑ E. Albarran-Zavala, B. A. Espinoza-Elizarraraz, F. Angulo-Brown "Joule Inversion Temperatures for Some Simple Real Gases", The Open Thermodynamics Journal 3 pp. 17-22 (2009)

Related reading

• Thomas R. Rybolt "A virial treatment of the Joule and Joule-Thomson coefficients", Journal of Chemical Education 58 pp. 620-624 (1981)