Fluctuational-thermodynamic interpretation of small angle X-ray scattering experiments in supercritical fluids

Роганков, В. Б.

doi:10.1016/j.fluid.2014.10.010

Cited by 10 publications

(39 citation statements)

References 28 publications

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“…It was shown recently [2,3] in the framework of FTmodel [4][5][6] that the aforementioned oversimplifications of ss-and/or hs-model are not necessary if one considers the more realistic LJ-type potential , / with the effectivedependent parameters ( ), ( ): The advantage of such approach in comparison with the conventional estimates of their constant LJ-counterparts , (mainly, from the experimental second-virial-coefficient's data) follows from the exact -dependence derived by FTmodel for any subcritical temperature:…”

Section: Introductionmentioning

confidence: 92%

Scaling Model of Low-Temperature Transport Properties for Molecular and Ionic Liquids

Роганков

2015

Journal of Thermodynamics

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The universal scaling concept is applied to the low-temperature range of any liquid states and substances located between the melting ( ) and normal boiling ( ) points far away from the critical region. The physical reason to develop such approach is the revealed collapse of all low-temperature isotherms onto the single universal one argued by the model of fluctuational thermodynamics (FT) proposed recently by author. The pressure reduced by the molecular parameters of the effective short-range Lennard-Jones (LJ) potential depends here only on the reduced density. To demonstrate the extraordinary predictive abilities of the developed lowtemperature scaling model it has been applied to the prediction of equilibrium and transport (kinetic and dynamic viscosity, self-diffusion, and thermal conductivity) properties not only for molecular liquids but also for molten organic salts termed ionic liquids (ILs). The best argument in favor of the proposed methodology is the appropriate consistency with the scarce experiments prediction of transport coefficients for ILs on the base of universal scaling function constructed for the simplest LJ-like liquid argon. The only input data of any substance for prediction are the linear approximations of T-dependent density and isobaric heat capacity taken from the standard measurements at atmospheric pressure.

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Section: Introductionmentioning

confidence: 92%

Scaling Model of Low-Temperature Transport Properties for Molecular and Ionic Liquids

Роганков

2015

Journal of Thermodynamics

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“…T-dependent generalized Riedel's parameter: FT v Ri has been introduced by FT-model [17][18][19][20]. Its thermodynamic coherence with the fundamental ratio of discontinuity in the enthalpy (latent heat) h T s ∆ = ∆ to the discontinuity in the isobaric work expressed by the saturated specific volumes:…”

Section: Configuration Of Coupled Supercritical Heterogeneous (Csh) Smentioning

confidence: 99%

“…taken alongside the bubble-dew boundaries of FT1, for example, remains meaningful. We refer now the interested reader to [17][18][19][20] for the other details of FT-model, since our attention will be concentrated below on the known irreversible Joule-Thompson (JT)-effect.…”

Section: Configuration Of Coupled Supercritical Heterogeneous (Csh) Smentioning

confidence: 99%

“…These observations were used to develop separately the 3-coefficient FT-EOS form for two fluid GPhs of g-and l-states [17][18][19][20]:…”

Section: Configuration Of Coupled Supercritical Heterogeneous (Csh) Smentioning

confidence: 99%

“…To obtain such a supposedly inter-percolation structure we used the finite-range, well-determined by CP-parameters of a real substance LJ/FT-potential [16]. The advantage of FT-methodology is also explainable by the revealed local correlation between the density order parameter (simulated by FT-model) ∆ ρ and the specific (or molar) entropy disorder parameter s ∆ (introduced in our pervious works [17][18][19][20]). The described NGF-structure of a coupled order-disorder state appears suddenly at the instantaneous quench of gl-or ll-gibbsian GPhs-states into FT2-region.…”

Section: Introductionmentioning

confidence: 99%

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Supercritical heterogeneous nanostructure of fluids. Part 2. Its potential impact on creation of coupled stirlings with intermediate regeneration of heat

Роганков¹,

Швець²,

Rogankov³

et al. 2019

ФАС

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Supercritical heterogeneous nanostructure of fluids. Part 2. Its potential impact on creation of coupled stirlings with intermediate regeneration of heat New concept of a supercritical fluid (SCF) region is proposed to explain the set of experimental and numerical observations in which the conventional asymptotic scaling theory and its crossover extension achieve the limit of applicability. An existence of heterogeneous steady nanostructure in the wide ranges of supercritical parameters termed the non-gibbsian fluid (NGF)-phase was hypothesized by one of authors (V.B.R.) in the framework of FT (fluctuational thermodynamics)-model. The practical usage of a such structure may be quite promising. In particular, the proposed here concept of the Coupled Supercritical Heterogeneous (CSH)-stirling engine might be, in principle, realized. It is composed by two coupled stirling-rallis type cycles with the standard regeneration devices and, additionally, with the intermediate (internal) recuperation of heat. The closed construction of both sub-cycles and of the proposed CSH-stirling, in total, is its advantage in comparison with the external forms of recuperation in the open cycles. Thus, our aim is the usage of the established NGF-properties to formulate the concept of an effective stirling-type cycle with the most appropriate working fluid SCF/CO 2 (carbon dioxide) instead of the conventional here He (helium) and H 2 (hydrogen) working fluids.

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Can the Boyle's and critical parameters be unambiguously correlated for polar and associating fluids, liquid metals, ionic liquids?

Rogankov

Роганков

2017

Fluid Phase Equilibria

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Fluctuational-thermodynamic interpretation of small angle X-ray scattering experiments in supercritical fluids

Cited by 10 publications

References 28 publications

Scaling Model of Low-Temperature Transport Properties for Molecular and Ionic Liquids

Scaling Model of Low-Temperature Transport Properties for Molecular and Ionic Liquids

Supercritical heterogeneous nanostructure of fluids. Part 2. Its potential impact on creation of coupled stirlings with intermediate regeneration of heat

Can the Boyle's and critical parameters be unambiguously correlated for polar and associating fluids, liquid metals, ionic liquids?

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