Some thermodynamic properties of SF6 on the binodal in the vicinity of the critical point
E.E. Ustyuzhanin1, V.F. Ochkov1, V.A. Rykov2, S.V. Rykov2,3, I.V. Kudryavtseva2
1Scientific Research University MEI, Moscow, Russia
2ITMO University, St. Petersburg, Russia
3Military Institute (Engineering and Technical) of Military Academy of Logistical Support named after A.V. Khrulev, St. Petersburg, Russia
Keywords: binodal, density, average diameter, order parameter, critical point, sulfur hexafluoride
Abstract
The presented paper considers a number of problems. The first of them concerns the analysis of experimental (ρl, ρg, T)-data for SF6 at relative temperatures (1,5∙10-8< τ < 0,3). The second task is related to the development of combined models (ρl(D, C, τ), ρg( D, C, τ), … ), that agree with a number of boundary conditions, including the requirements of the scale theory of critical phenomena. The third task is to calculate (D, C)-parameters included in the combined models; at this stage, a basic array of (ρl, ρg, T)-data is formed, including experimental results obtained in the laboratory of Prof. Funke (Germany), and (ρl, ρg, T)-data obtained by recalculating the results in the laboratory of Prof. Garrabos (France). The models for (ρl(D, C, τ) and ρg(D, C, τ) served as the basis for calculating some thermodynamic properties of SF6 in the critical region.
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