Experimental approaches to study thermodiffusion – A review

Srinivasan, Seshasai; Saghir, M. Ziad

doi:10.1016/j.ijthermalsci.2011.02.022

Cited by 57 publications

(67 citation statements)

References 160 publications

(181 reference statements)

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“…Other excellent reviews were written by Srinivasan and Saghir [11], Platten [12], and Wiegand [13]. The methods that are of most interest in the context of the present paper are fast methods that work at very small length scale, such as optical beam deflection [14], thermal diffusion forced Rayleigh scattering [15,16], and optical digital interferometry [17].…”

Section: Introductionmentioning

confidence: 94%

Non-equilibrium molecular dynamics simulations of the transient Ludwig-Soret effect in a binary Lennard-Jones/spline mixture

Hafskjold

2017

Eur. Phys. J. E

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SummaryA binary isotope mixture of Lennard-Jones/spline particles at equilibrium was perturbed by a sudden change in the system's boundary temperatures. The system's response was determined by nonequilibrium molecular dynamics (NEMD). Three transient processes were studied: (1) The propagation of a pressure (shock) wave, (2) heat diffusivity and conduction, and (3) thermal diffusion (the LudwigSoret effect). These three processes occur at different time scales, which makes it possible to separate them in one single NEMD run. The system was studied in liquid, supercritical, and dense gas states with various forms and strengths of the thermal perturbation. The results show that heat was initially transported by two separate mechanisms; (1) heat diffusion as described by the transient heat equation and (2) as a consequence of a pressure wave. The pressure wave travelled faster than the speed of sound, generating a shock wave in the system. Local equilibrium was found in the transient phase, even with very strong perturbations and in the shock front. Although the mass separation due to the Ludwig-Soret effect developed much slower than the pressure and temperature fields in the system at large, it was found that the Soret coefficient could be accurately determined from the initial phase of the transient and close to the heat source. This opens the possibility of a new way to analyse results from transient experiments and thereby minimize effects of gravity and convection due to buoyancy.

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Section: Introductionmentioning

confidence: 94%

Non-equilibrium molecular dynamics simulations of the transient Ludwig-Soret effect in a binary Lennard-Jones/spline mixture

Hafskjold

2017

Eur. Phys. J. E

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“…From the results of these experiments, the Fontainebleau benchmark values of thermodiffusion coefficient for these mixtures were established [23,[29][30][31][32]. A detailed review of all the methods has been published recently by Srinivasan and Saghir [33]. Likewise, several devices have been developed to analyze and determine the molecular diffusion coefficient.…”

Section: Introductionmentioning

confidence: 99%

Thermodiffusion and molecular diffusion in binaryn-alkane mixtures: experiments and numerical analysis

Srinivasan

Mezquıa

Bou-Ali

et al. 2011

Philosophical Magazine

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New experimental data on the thermodiffusion and molecular diffusion coefficients of nine non-equimolar binary mixtures of nC 6 À nC i (i ¼ 10, . . . , 18) at 298 K and 1 atm have been reported. The data have been obtained using a combination of the thermogravitational column and the sliding symmetric tubes technique, respectively. It was found that with an increase in the disparity between the two components, the Soret effect becomes more dominant. Further, the stronger Soret effect weakens the molecular diffusion process. These trends are observed in the form of an increase in magnitude of the thermodiffusion coefficient and a decrease in the magnitude of the molecular diffusion coefficient. Numerical analysis was also performed using the principles of non-equilibrium thermodynamics. The model was able to predict the experimental data as well as the trends fairly accurately.

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“…Major experimental methods used to obtain thermodiffusion coefficients have been briefly reviewed in a recent work by Srinivasan and Saghir (2011) and in an earlier work by Platten (2006). Platten also reviews some experimental works on hydrocarbon mixtures with an emphasis on the importance of having reliable benchmark databases for model validation.…”

Section: Review Papersmentioning

confidence: 99%

Advances in Thermodiffusion and Thermophoresis (Soret Effect) in Liquid Mixtures

Eslamian¹

2012

Frontiers in Heat and Mass Transfer

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Recent advances in thermodiffusion (Soret effect) in binary and higher multicomponent liquid mixtures are reviewed. The mixtures studied include the hydrocarbon, associating, molten metal and semiconductor, polymer, and DNA mixtures. The emphasis is placed on the theoretical works, particularly models based on the nonequilibrium thermodynamics, although other approaches such as the statistical, kinetic and hydrodynamic approaches are discussed as well. For each mixture, the major theoretical and experimental works are discussed and the research trends and challenges are addressed. Some of the challenges include a need for combining various methods to develop a comprehensive theoretical model or at least to try to understand the differences and pros and cons of each approach. Thermodiffusion and ordinary diffusion coefficients are scarce in some mixtures such as binary DNA, molten metal and metal-semiconductor mixtures and all ternary mixtures. Understanding of the molecular structure of associating mixtures, and modeling of thermodiffusion in such mixtures are also very challenging.

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Experimental approaches to study thermodiffusion – A review

Cited by 57 publications

References 160 publications

Non-equilibrium molecular dynamics simulations of the transient Ludwig-Soret effect in a binary Lennard-Jones/spline mixture

Non-equilibrium molecular dynamics simulations of the transient Ludwig-Soret effect in a binary Lennard-Jones/spline mixture

Thermodiffusion and molecular diffusion in binaryn-alkane mixtures: experiments and numerical analysis

Advances in Thermodiffusion and Thermophoresis (Soret Effect) in Liquid Mixtures

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