Difference between revisions of "Joule-Thomson effect"

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==Inversion temperature==
 
==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/10.1119/1.17417 Jacques-Olivier Goussard and Bernard Roulet "Free expansion for real gases", American Journal of Physics '''61''' pp.  845-848 (1993)]</ref>
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<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>
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==References==
 
==References==
 
<references/>
 
<references/>

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

\mu_{\mathrm JT} = \left. \frac{\partial T}{\partial p} \right\vert_H

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

In terms of heat capacities one has

\mu_{\mathrm JT} C_V = -\left. \frac{\partial E}{\partial V} \right\vert_T

and

\mu_{\mathrm JT} C_p = -\left. \frac{\partial H}{\partial p} \right\vert_T


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

\mu_{\mathrm JT}\vert_{p=0} = ^0\!\!\phi = B_2(T) -T \frac{dB_2(T)}{dT}

Inversion temperature[edit]

[1] [2]

References[edit]

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