The thermal diffusion factor of the van der Waals binary mixture

Castillo, Rolando; Orozco, J.

doi:10.1063/1.473824

Cited by 6 publications

(3 citation statements)

References 32 publications

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“…Reliable data on thermal diffusion are scarce in the literature and they are essential for comparison with simulations of molecular dynamics [8,10] and recent predictions from kinetic theory [9]. Reliable data on thermal diffusion are scarce in the literature and they are essential for comparison with simulations of molecular dynamics [8,10] and recent predictions from kinetic theory [9].…”

Section: Resultsmentioning

confidence: 99%

Soret Coefficient of Some Binary Liquid Mixtures

Bou-Ali¹,

Ecenarro²,

Madariaga³

et al. 1999

Journal of Non-Equilibrium Thermodynamics

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We have measured with the thermogravitational method the Soret coef®cient of the binary liquid systems: benzenenhexane, toluenenheptane and carbon tetrachloride with heptane and hexane, in a well characterized column used in a previous work to measure the systems benzenenheptane and toluenenhexane. The obtained results show that the Soret coef®cient takes nearly the same value in the mixtures of each one of the components, benzene, toluene or carbon tetrachloride with hexane and heptane. For all the systems considered it varies slowly with the concentration and is nearly independent of temperature. The higher values of the thermal diffusion factor correspond to mixtures containing carbon tetrachloride. Previous results for these systems were obtained in an imperfect apparatus and must be disregarded.In the afore-mentioned paper [4], we also report the re-measured values of the Soret coef®cient for benzene and nheptane mixtures, which also differ from those reported by Ecenarro et al. [1]. In the present work, using the new setup, we reappraise the

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Section: Resultsmentioning

confidence: 99%

Soret Coefficient of Some Binary Liquid Mixtures

Bou-Ali¹,

Ecenarro²,

Madariaga³

et al. 1999

Journal of Non-Equilibrium Thermodynamics

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“…At a mixture critical locus, for i , j = 1 to N − 1, the determinant |α D , i j | is null, which also implies that | D i j | is null . Also, the transport properties introduced above are intrinsically dependent on molecular interaction rates induced by thermodynamic fluctuations. ,,,,, In fact, transport mechanisms and chemical changes, or reaction rates, occupy a common perspective in fluctuation−dissipation theory …”

Section: Nonequilibrium Thermodynamics and Eyring Rate Theory Modelmentioning

confidence: 99%

“…At a critical point, α D ,11 becomes null. This is an essential reason for the finding of vanishing mass diffusion coefficients and very large thermal diffusion factors (or Soret coefficients) during measurements in the region of near criticality. ,,,− Because of the difficulty of common equation-of-state models in accurately calculating values of α D ,11 for dense mixtures, ,, obtaining the desired binary α BK,12 values from experimental data involves potentially considerable error, because of both possible measurement error and error in the α D ,11 values.…”

Section: Literature Survey On the Soret Effect And Themes Foundmentioning

confidence: 99%

Modeling the Soret Effect in Dense Media Mixtures

Harstad

2009

Ind. Eng. Chem. Res.

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A basic aim of this paper is to provide, as much as possible, a comprehensive and unambiguous description of the Soret effect in dense media. To this end, the available literature was examined for unifying themes; the themes found are presented. Many trends in the behavior of thermal diffusion coefficients are found to be correlated to equation-of-state properties. The evolutionary paths of media undergoing heating have the essential constraint of positive entropy production, as expressed by the theoretical relations of nonequilibrium thermodynamics; these are summarized. Also given are the relations between thermodynamic forces that define the path attractor states of media mixtures under steady heating conditions. Data references are given; almost all the available data relates to these asymptotic steady attractor states. There is little or no data available corresponding to the transient paths that are explicitly more dependent on the species diffusive transport mechanisms (rates). The concept of "heats of transfer" to express the thermal diffusion factors is verified to be generally valid for a slight modification of the defining relation as commonly presented. The heats of transfer are equivalent to an extension of kinetic theory thermal diffusion ratios. A discussion on the perspectives needed to properly form generic thermal diffusion models that are valid for any particular situation is given.

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Dependence of thermal diffusion factor of binary mixtures to the thermodynamic state by NEMD simulation

Yeganegi¹,

Ganji²

2005

Chemical Physics

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The thermal diffusion factor of the van der Waals binary mixture

Cited by 6 publications

References 32 publications

Soret Coefficient of Some Binary Liquid Mixtures

Soret Coefficient of Some Binary Liquid Mixtures

Modeling the Soret Effect in Dense Media Mixtures

Dependence of thermal diffusion factor of binary mixtures to the thermodynamic state by NEMD simulation

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