Gravity effects on Soret-induced non-equilibrium fluctuations in ternary mixtures

Pancorbo, Pablo Martínez; Zárate, José M. Ortiz de; Bataller, Henri; Croccolo, Fabrizio

doi:10.1140/epje/i2017-11513-9

Cited by 16 publications

(7 citation statements)

References 47 publications

(140 reference statements)

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“…Partial results have already been published 18 , 19 including experiments on non-equilibrium fluctuations in binary 37 , 38 and ternary mixtures. 39 , 40 …”

Section: Discussionmentioning

confidence: 99%

Thermodiffusion in multicomponent n-alkane mixtures

et al. 2017

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Compositional grading within a mixture has a strong impact on the evaluation of the pre-exploitation distribution of hydrocarbons in underground layers and sediments. Thermodiffusion, which leads to a partial diffusive separation of species in a mixture due to the geothermal gradient, is thought to play an important role in determining the distribution of species in a reservoir. However, despite recent progress, thermodiffusion is still difficult to measure and model in multicomponent mixtures. In this work, we report on experimental investigations of the thermodiffusion of multicomponent n-alkane mixtures at pressure above 30 MPa. The experiments have been conducted in space onboard the Shi Jian 10 spacecraft so as to isolate the studied phenomena from convection. For the two exploitable cells, containing a ternary liquid mixture and a condensate gas, measurements have shown that the lightest and heaviest species had a tendency to migrate, relatively to the rest of the species, to the hot and cold region, respectively. These trends have been confirmed by molecular dynamics simulations. The measured condensate gas data have been used to quantify the influence of thermodiffusion on the initial fluid distribution of an idealised one dimension reservoir. The results obtained indicate that thermodiffusion tends to noticeably counteract the influence of gravitational segregation on the vertical distribution of species, which could result in an unstable fluid column. This confirms that, in oil and gas reservoirs, the availability of thermodiffusion data for multicomponent mixtures is crucial for a correct evaluation of the initial state fluid distribution.

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“…Partial results have already been published 18 , 19 including experiments on non-equilibrium fluctuations in binary 37 , 38 and ternary mixtures. 39 , 40 …”

Section: Discussionmentioning

confidence: 99%

Thermodiffusion in multicomponent n-alkane mixtures

et al. 2017

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“…Experimental investigation of the dynamics of c-NEFs has been proposed as a novel technique for the simultaneous measurement of diffusion and thermal diffusion coefficients in binary mixtures [12,62], with a possible extension to ternary and multi-component mixtures [63][64][65]. A quick and robust method to obtain reliable values for these coefficients is of high interest to the oil industry, and may open new applications.…”

Section: Introductionmentioning

confidence: 99%

Confinement effect on the dynamics of non-equilibrium concentration fluctuations far from the onset of convection

et al. 2016

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In a recent letter [C. Giraudet et al., Europhys. Lett. 111, 60013 (2015)] we reported preliminary data showing evidence of a slowing down of non-equilibrium fluctuations of the concentration in thermodiffusion experiments on a binary mixture of miscible fluids. The reason for this slowing down was attributed to the effect of confinement. Such tentative explanation is here experimentally corroborated by new measurements and theoretically substantiated by studying analytically and numerically the relevant fluctuating hydrodynamics equations. In the new experiments presented here, the magnitude of the temperature gradient is changed, confirming that the system is controlled solely by the solutal Rayleigh number, and that the slowing down is dominated by a combined effect of the driving force of buoyancy, the dissipating force of diffusion and the confinement provided by the vertical extension of the sample cell. Moreover, a compact phenomenological interpolating formula is proposed for easy analysis of experimental results.

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“…For oscillatory instability, nonlinear calculations show that convective separation is observed in the range of Rayleigh numbers close to the boundary values. Pancorbo et al [34] proposed an analysis of the stability of a ternary gas mixture, which is brought out of equilibrium by imposing an external stable temperature gradient. For the concentration equations, a diagonalizing diffusion matrix was used.…”

Section: Thermal Diffusion and Convective Stability In Nonisothermal ...mentioning

confidence: 99%

Diffusion mechanisms of convective instability in liquid and gas mixtures

Kossov,

Altenbach

2023

Z Angew Math Mech

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A review of publications on stability of mechanical equilibrium of multicomponent mixtures in gases and liquids under non‐isothermal and isothermal conditions is given. Studies where diffusion in binary and multicomponent mixtures led to the occurrence of instability of mechanical equilibrium of the system have been analyzed. The main attention is paid to the description of approaches predicting the areas where there are increasing convective disturbances, as well as the determination of the spectrum of thermophysical parameters where the contribution of convection to heat and mass transfer is negligible. At the same time, the problems determining the role of diffusion, thermodiffusion, and double diffusion mechanisms in the separation of mixture components at the boundary of convective instability were given priority in the description. The results of investigations related to the study of the evolution of flows arising due to instability at the initial stage of mixing were also discussed.

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Gravity effects on Soret-induced non-equilibrium fluctuations in ternary mixtures

Cited by 16 publications

References 47 publications

Thermodiffusion in multicomponent n-alkane mixtures

Thermodiffusion in multicomponent n-alkane mixtures

Confinement effect on the dynamics of non-equilibrium concentration fluctuations far from the onset of convection

Diffusion mechanisms of convective instability in liquid and gas mixtures

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