Jurij Avsec (Author), Milan Marčič (Author)

Abstract

Članek obravnava matematični model izračuna termodinamičnih veličin stanja v kapljevitem, plinastem in dvofaznem območju s pomočjo statistične termodinamike. Članek obravnava vse pomembne vplive (translacijo, rotacijo, notranjo rotacijo, vibracijo, medmolekularno potencialno energijo kot vpliv vzbujanja elektronov in jeder). Za izračun termodinamičnih veličin stanja realnih plinov smo razvili model gruč, s pomočjo katerega smo dobili boljše rezultate kot s klasično virialno teorijo realnih plinov. Za področje realne kapljevine smo uporabili Johnson-Zollweg-Gubbinsow model, ki je zasnovan na osnovi modificirane Benedict-Webb-Rubinove enačbe stanja. Za medmolekularni potencial smo uporabili Lennard-Jonesov potencial. Analitični izračuni so primerjani s termodinamičnimi podatki in modeli dobljeni s pomočjo klasične termodinamike in kažejo na relativno dobro ujemanje.

Keywords

thermodynamic;statistical thermodynamic;liquid-gas;thermodynamic properties;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UM FS - Faculty of Mechanical Engineering
Publisher: Slovensko kemijsko društvo
UDC: 536.75
COBISS: 4714262 Link will open in a new window
ISSN: 1318-0207
Views: 713
Downloads: 69
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Other data

Secondary language: Slovenian
Secondary abstract: The paper features the mathematical model of computing phase diagrams and thermodynamic functions of the state in the liquid, gas and two phase domain with the help of statistical thermodynamics. The paper features all important contributions (translation, rotation, internal rotation, vibration, intermolecular potential energy and influenceof electron and nuclei excitation). To calculate the thermodynamic properties of real gases we developed the cluster theory, which yields better results than the classical virial equation. For the realm of real liquids the Johnson-Zollweg-Gubbins model basedon the modified Benedict-Webb-Rubin eqution was applied. The Lennard-Jones intermolecular was used. The analytical resulats are compared with the thermodynamical data and models obtained by classical thermodynamics and show relatively good agreement.
Secondary keywords: termodinamika;statistična termodinamika;kapljevina/plin;termodinamične lastnosti;thermodynamic;statistical thermodynamic;liquid-gas;thermodynamic properties;
URN: URN:NBN:SI
Type (COBISS): Scientific work
Pages: str. 375-388
Volume: ǂVol. ǂ46
Issue: ǂšt. ǂ3
Chronology: 1999
ID: 1750212