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Phase separation and rheology of segregating binary fluid under shear
Daniya Davis1, Parameshwaran A1, Bhaskar Sen Gupta1
1Vellore Institute of Technology, Department of Physics, School of Advanced Sciences, Vellore, Tamil Nadu 632014, India.
Physical Review. E
|August 1, 2025
Summary
This study used molecular dynamics simulations to explore how shear deformation affects binary liquid mixtures. We found that increasing shear intensity distorts domains, leading to anisotropic structures and non-Newtonian fluid behavior.
Area of Science:
- Soft Matter Physics
- Materials Science
- Computational Chemistry
Background:
- Understanding phase separation and rheology in liquid mixtures is crucial for materials design.
- Hydrodynamic interactions significantly influence the behavior of multi-component fluids.
Purpose of the Study:
- To investigate the effects of simple shear deformation on the phase separation and rheological properties of a 3D binary liquid mixture.
- To quantify the impact of shear intensity on domain growth and structural anisotropy.
Main Methods:
- Molecular dynamics simulations were employed to model a three-dimensional binary liquid mixture.
- Simple shear deformation was applied to study the system's response.
- Structural anisotropy was quantified by measuring domain sizes along flow and shear directions.
Main Results:
- Shear deformation primarily distorts domains, inducing the formation of anisotropic structures.
- Domain growth is dependent on shear intensity.
- The system exhibits Newtonian fluid behavior at low shear rates, transitioning to non-Newtonian behavior at high shear rates.
Conclusions:
- Shear flow significantly alters the morphology and rheology of binary liquid mixtures.
- The transition to non-Newtonian behavior under strong shear is a key characteristic of this system.
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