Dissipative particle dynamics study of phase separation in binary fluid mixtures in periodic and confined domains

We investigate the phase separation behavior of binary mixtures in two-dimensional periodic and confined domains using dissipative particle dynamics. Two canonical problems of fluid mechanics are considered for the confined domains: square cavity with no-slip walls and lid-driven cavity with one dri...

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Bibliographic Details
Published in:The Journal of chemical physics 2017-08, Vol.147 (7), p.074703-074703
Main Authors: Gidituri, Harinadha, Anand, D. Vijay, Vedantam, Srikanth, Panchagnula, Mahesh V.
Format: Article
Language:English
Subjects:
Binary fluids
Binary mixtures
Domains
Dynamic structural analysis
Fluid dynamics
Fluid mechanics
Ocean circulation
Phase separation
Slip
Structure factor
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Summary:We investigate the phase separation behavior of binary mixtures in two-dimensional periodic and confined domains using dissipative particle dynamics. Two canonical problems of fluid mechanics are considered for the confined domains: square cavity with no-slip walls and lid-driven cavity with one driven wall. The dynamics is studied for both weakly and strongly separating mixtures and different area fractions. The phase separation process is analyzed using the structure factor and the total interface length. The dynamics of phase separation in the square cavity and lid-driven cavity are observed to be significantly slower when compared to the dynamics in the periodic domain. The presence of the no-slip walls and the inertial effects significantly influences the separation dynamics. Finally, we show that the growth exponent for the strongly separating case is invariant to changes in the inter-species repulsion parameter.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.4999096