# Difference between revisions of "Joule-Thomson effect"

Carl McBride (talk | contribs) |
m (→Inversion temperature) |
||

(4 intermediate revisions by 2 users not shown) | |||

Line 1: | Line 1: | ||

− | The '''Joule-Thomson effect''' is also known as the ''Joule-Kelvin effect''. | + | 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. |

==Joule-Thomson coefficient== | ==Joule-Thomson coefficient== | ||

The Joule-Thomson coefficient is given by | The Joule-Thomson coefficient is given by | ||

Line 18: | Line 18: | ||

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

− | :<math>\mu_{\mathrm JT} = B_2 -T \frac{dB_2}{dT}</math> | + | :<math>\mu_{\mathrm JT}\vert_{p=0} = ^0\!\!\phi = B_2(T) -T \frac{dB_2(T)}{dT}</math> |

+ | ==Inversion temperature== | ||

+ | <ref>[http://dx.doi.org/10.1119/1.17417 Jacques-Olivier Goussard and Bernard Roulet "Free expansion for real gases", American Journal of Physics '''61''' pp. 845-848 (1993)]</ref> | ||

+ | <ref>[http://dx.doi.org/10.2174/1874396X00903010017 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)]</ref> | ||

+ | |||

==References== | ==References== | ||

− | + | <references/> | |

+ | '''Related reading''' | ||

+ | *[http://jchemed.chem.wisc.edu/Journal/Issues/1981/Aug/jceSubscriber/JCE1981p0620.pdf Thomas R. Rybolt "A virial treatment of the Joule and Joule-Thomson coefficients", Journal of Chemical Education '''58''' pp. 620-624 (1981)] | ||

[[category: classical thermodynamics]] | [[category: classical thermodynamics]] | ||

[[category: statistical mechanics]] | [[category: statistical mechanics]] |

## Latest revision as of 15:22, 20 October 2009

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.

## Joule-Thomson coefficient[edit]

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

## Inversion temperature[edit]

^{[1]}
^{[2]}

## References[edit]

- ↑ Jacques-Olivier Goussard and Bernard Roulet "Free expansion for real gases", American Journal of Physics
**61**pp. 845-848 (1993) - ↑ 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**