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Equations of state from van der Waals theory: recent developments. 2. Statistical approach, from partition function to equations of state.

Equations d'état issues de la théorie de Van der Waals. Evolutions récentes. 2. Approche statistique de la fonction de partition à l'équation d'état.

Author(s) : TAVITIAN B.

Type of article: Article

Summary

The hard sphere theory considers that molecules cannot interpenetrate: thus, repulsive forces are represented by a "wall" of potential, taking an infinite value at distances less than the diameter of the molecule assimilated to spheres. An empirical factor is sometimes introduced to express the departure to sphericity. Hard chain theories take into account the flexibility of molecules, by breaking up the molecules into segments. An empirical parameter represents the relative degree of freedom of the segments. Attraction terms are generally dealt with as perturbations, and either estimated in an empirical manner, or result from molecular dynamics simulations.

Details

  • Original title: Equations d'état issues de la théorie de Van der Waals. Evolutions récentes. 2. Approche statistique de la fonction de partition à l'équation d'état.
  • Record ID : 1993-3206
  • Languages: French
  • Source: Entropie - vol. 28 - n. 172-173
  • Publication date: 1992
  • Document available for consultation in the library of the IIR headquarters only.

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