Phase separation of fluids in porous media: A molecular dynamics study

Ahmad, Shaista; Puri, Sanjay; Das, Subir K.

doi:10.1103/physreve.90.040302

Cited by 17 publications

(15 citation statements)

References 44 publications

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“…Though MD simulations in this context are relatively rare, the theoretical expectations for critical quenches are confirmed to a good degree [11,[37][38][39][40][41]. Here we focus on vapor-liquid phase separation, for which MD simulations are mostly recent [42][43][44][45][46][47][48][49].…”

Section: Simulation Resultsmentioning

confidence: 82%

“…In experiments, care should be taken to remove the external effects, e.g., gravity and impurity. On the other hand, it is possible to do simulation studies of more realistic models [41,90] by incorporating the above-mentioned effects, particularly when improved computational resources are available.…”

Section: Resultsmentioning

confidence: 98%

“…In addition, the effects of disorder in the kinetics of fluid phase separation have been looked at [41] and compared with the case of disordered Ising systems. The lack of space, however, prevents us from including these results.…”

Section: Resultsmentioning

confidence: 99%

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Coarsening in fluid phase transitions

Das

Roy

Midya

2015

Comptes Rendus. Physique

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We review the understanding of the kinetics of fluid phase separation in various space dimensions. Morphological differences, percolating or disconnected domains, based on overall composition in a binary liquid or on density in a vapor-liquid system, are discussed. Depending upon the morphology, various possible mechanisms for domain growth are pointed out and discussions of corresponding theoretical predictions are provided. On the computational front, useful models and simulation methodologies are presented. Theoretically predicted growth laws have been tested via molecular dynamics simulations of vapor-liquid transitions. In the case of a disconnected structure, the mechanism has been confirmed directly.© 2015 Académie des sciences. Published by Elsevier Masson SAS. All rights reserved. r é s u m éNous passons en revue la compréhension de la cinétique de séparation de phases fluides dans diverses dimensions d'espace. Les différences morphologiques, les domaines de percolation ou déconnectés, basés sur la composition totale binaire ou sur la densité dans un système vapeur-liquide, sont discutés. Selon la morphologie, les différents mécanismes possibles sont présentés et les prédictions théoriques correspondantes discutées. Du côté du calcul par ordinateur, des modèles utiles et des méthodes de simulation sont présentées. Des lois de croissance prédites théoriquement ont été testées au moyen de simulations de dynamique moléculaire des transitions vapeur-liquide. Dans le cas d'une structure déconnectée, le mécanisme a été confirmé directement.

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Section: Simulation Resultsmentioning

confidence: 82%

Section: Resultsmentioning

confidence: 98%

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Coarsening in fluid phase transitions

Das

Roy

Midya

2015

Comptes Rendus. Physique

Self Cite

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“…However, in the presence of impurity, a nonlinear or cusp nature is observed, which can be attributed to the scattering from the rough domain boundary [42]. Therefore, the annealed disorder results in breaking down the Porod law in the correlation function [43]. The evolution morphology is best realized in terms of the domain size (t).…”

Section: A Domain Morphology and Growth Dynamicsmentioning

confidence: 99%

Effect of Annealed Disorder on Phase Separation Kinetics and Aging Phenomena in Fluid Mixtures

Bhattacharyya,

Gupta

2021

Preprint

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We use state-of-the-art molecular dynamics simulations to study the effects of annealed disorder on the phase separating kinetics and aging phenomena of a segregating binary fluid mixture. In the presence of disorder, we observe a dramatic slowing down in the phase separation dynamics. The domain growth follows the powerlaw with a disorder-dependent exponent. Due to the energetically favorable positions, the domain boundary roughens which modifies the correlation function and structure factor to a non-Porod behavior. The correlation function and structure factor provide clear evidence that the superuniversality does not hold in our system. The role of annealed disorder on the non-equilibrium aging dynamics is studied qualitatively by computing the twotime order parameter autocorrelation function. The decay of the correlation function slows down significantly with the disorder. This quantity exhibits scaling laws with respect to the ratio of the domain length at the observation time and the age of the system. We find the scaling laws hold good for the disordered system and therefore, robust and generic to such segregating fluid mixtures.

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“…However, in the presence of impurity, a nonlinear or cusp nature is observed, which can be attributed to the scattering from the rough domain boundary [39]. Therefore, the quench disorder results in breaking down the Porod law in the correlation function [40].…”

Section: Periodic Boundary Condition Is Applied In All Three Directionsmentioning

confidence: 99%

Phase Separation in Binary Fluid Mixture with Quenched Disorder

Gupta¹

2021

Preprint

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Quenched or frozen-in, structural disorder is ubiquitous in real experimental systems. Much of the progress is achieved in understanding the phase separation of such systems using diffusion-driven coarsening in Ising model with quenched disorder. But there is a paucity of research in the phase-separation kinetics in fluids with quenched disorder. In this letter, we present results from a detailed Molecular dynamics (MD) simulation the effects of randomly placed localized impurities on the phase separating kinetics of binary fluid mixture. Our system resembles the fluid imbibed into a porous medium. We observe a dramatic slowing down in the pattern formation with increasing pin particle concentration. The domain growth follows the power-law with a disorder-dependent exponent. Due to the energetically favorable positions, the domain boundary roughens which modifies the correlation function and structure factor to a non-Porod behavior. The correlation function and structure factor provide clear evidence that the superuniversality does not hold in our system.

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Phase separation of fluids in porous media: A molecular dynamics study

Cited by 17 publications

References 44 publications

Coarsening in fluid phase transitions

Coarsening in fluid phase transitions

Effect of Annealed Disorder on Phase Separation Kinetics and Aging Phenomena in Fluid Mixtures

Phase Separation in Binary Fluid Mixture with Quenched Disorder

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