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Phase separation in binary fluid mixtures with symmetric and asymmetric Schmidt numbers: A DPD study
Harinadha Gidituri1, V S Akella1, Srikanth Vedantam2
1Department of Applied Mechanics, Indian Institute of Technology Madras, Chennai 600 036, India.
The Journal of Chemical Physics
|June 24, 2019
Summary
The Schmidt number (Sc) influences phase separation dynamics in immiscible fluids. Higher Sc values slow down domain growth, with distinct coarsening exponents observed for critical and off-critical mixtures.
Area of Science:
- Fluid Dynamics
- Soft Matter Physics
- Computational Physics
Background:
- Phase separation is crucial in liquid-liquid systems.
- Domain coarsening dynamics are governed by characteristic exponents.
- The Schmidt number (Sc) relates momentum and mass diffusivity, impacting fluid behavior.
Purpose of the Study:
- To investigate the influence of the Schmidt number (Sc) on the phase separation dynamics of two immiscible fluids.
- To analyze how varying Sc affects domain growth and coarsening mechanisms.
- To explore these effects in both critical and off-critical mixtures.
Main Methods:
- Utilizing dissipative particle dynamics (DPD) simulations.
- Simulating phase separation in a two-dimensional periodic box.
- Analyzing domain size growth over time using power-law relationships.
Main Results:
- Increasing Schmidt number (Sc) for either fluid consistently slows down phase separation dynamics.
- A power-law exponent (β) of 0.5 was observed for symmetric critical mixtures (ScA = ScB).
- An exponent of β = 0.33 was found for all other cases, including off-critical mixtures, irrespective of the Sc ratio.
Conclusions:
- The Schmidt number plays a significant role in modulating phase separation kinetics.
- The observed coarsening exponents are linked to the interplay between diffusive and dynamical forces.
- Results provide insights into controlling and understanding liquid-liquid separation processes.
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