Simulation of Ludwig–Soret effect of a water–ethanol mixture in a cavity filled with aluminum oxide powder under high pressure

Jiang, Charles; Jaber, T. J.; Bataller, Henri; Saghir, M.Z.

doi:10.1016/j.ijthermalsci.2007.01.019

Cited by 15 publications

(9 citation statements)

References 19 publications

(19 reference statements)

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“…Some of these studies show a slight decrease of the Soret coefficients with increasing pressure. [43][44][45][46][47][48][49] Our simulations indicate that the Soret coefficient would not undergo significant changes in the pressure and temperature ranges studied here. Our results, therefore, indicate that the differences between simulation and experiments are likely connected to the force-field.…”

Section: Resultsmentioning

confidence: 99%

The role of ion–water interactions in determining the Soret coefficient of LiCl aqueous solutions

Lecce

Albrecht

Bresme

2017

Phys. Chem. Chem. Phys.

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The application of a thermal gradient to an aqueous electrolyte solution induces the Soret effect, and the salt migrates towards hot (thermophilic) or cold regions (thermophobic). Experimental studies of LiCl reported changes in the sign of the Soret coefficient as well as a minimum in this coefficient at specific salt concentrations and temperatures. At the minimum the thermodiffusive response of the solution is enhanced significantly. We have performed non-equilibrium molecular dynamics simulations of LiCl solutions to quantify the dependence of the sign change and minimum of the Soret coefficient with salt concentration and temperature. We find that the ion mass plays a secondary role in determining the magnitude of the Soret coefficient, while the diameter of the cation has a significant impact on the coefficient and on the observation of the minimum. Our simulations show that the ordering of water around Li + plays a key role in determining the Soret coefficient of LiCl salts.

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Section: Resultsmentioning

confidence: 99%

The role of ion–water interactions in determining the Soret coefficient of LiCl aqueous solutions

Lecce

Albrecht

Bresme

2017

Phys. Chem. Chem. Phys.

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“…In fact, a good agreement between the results based on the parallel flow solution corresponding to Eq. (19) and those of the pseudo conductive and boundary layer regimes is observed at sufficiently small and large values of R T , respectively. Finally, it is to outline that, in pure diffusive regime, Nu and Sh are governed by Eq.…”

Section: Effect Of Thermal Rayleigh Number R Tmentioning

confidence: 86%

“…Studies involving effects of both horizontal and vertical hydrodynamic and thermal heterogeneity on the onset of convection in a horizontal layer of saturated isotropic [12] and anisotropic [13] porous media, uniformly heated from below, are studied analytically using linear stability theory for the case of weak heterogeneity. Thermodiffusion combined with nonBoussinesq behaviors [14], gravity gradients [15], cross gradients of temperature and concentration [16,17], boundary layer behaviors [18] and analysis of the Soret coefficient [19] have also been the object of interest. Karcher and Müller [14] studied Bénard convection in a mixture displaying Soret effects and obeying a nonlinear density-temperature relation.…”

Section: Introductionmentioning

confidence: 99%

“…It was found that different boundary layer behaviors are possible depending on the range of the Soret parameter for given values of the buoyancy ratio and the Lewis number. Jiang et al [19] made a numerical study to investigate thermosolutal convection of a water-ethanol binary mixture, in a three-dimensional horizontal cavity, filled with an aluminium oxide (Al 2 O 3 ). The thermal diffusion or Soret effect is analyzed globally with a separation ratio and locally with the distributions of ethanol mole fraction on the horizontal and vertical lines in the centre of the porous cavity.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Thermosolutal convection within a vertical porous enclosure in the case of a buoyancy ratio balancing the separation parameter

Er‐Raki¹,

Hasnaoui²,

Amahmid³

et al. 2009

International Journal of Thermal Sciences

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“…D * is the molecular diffusion coefficient in the porous medium, which is related to the molecular diffusion coefficient in the free liquid D by the relation [22]:…”

Section: Theoretical Relationsmentioning

confidence: 99%

Thermodiffusion of the tetrahydronaphthalene and dodecane mixture under high pressure and in porous medium

Giraudet

Croccolo

Galliéro

et al. 2013

Comptes Rendus. Mécanique

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A thermodiffusion cell is used in order to perform Soret experiments on binary mixtures at high pressure and in the presence of a porous medium. The cell is validated at atmospheric pressure with toluene/hexane and the tetrahydronaphthalene/dodecane mixtures. The mass separation follows a diffusive behaviour when the cell is filled with a porous medium. At least three times the relaxation time is needed to have a good estimation of the Soret coefficients. From the transient state of the mass separation and using accepted values of the diffusion coefficient, the tortuosity of the porous medium was evaluated, too. Finally, experiments at high pressure were performed with the tetrahydronaphthalene/dodecane system. In these experiments, decreases of the Soret coefficient and of the tortuosity of the porous medium were measured as a function of the pressure.

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Simulation of Ludwig–Soret effect of a water–ethanol mixture in a cavity filled with aluminum oxide powder under high pressure

Cited by 15 publications

References 19 publications

The role of ion–water interactions in determining the Soret coefficient of LiCl aqueous solutions

The role of ion–water interactions in determining the Soret coefficient of LiCl aqueous solutions

Thermosolutal convection within a vertical porous enclosure in the case of a buoyancy ratio balancing the separation parameter

Thermodiffusion of the tetrahydronaphthalene and dodecane mixture under high pressure and in porous medium

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