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Visually Based Characterization of the Incipient Particle Motion in Regular Substrates: From Laminar to Turbulent Conditions
Published on: February 22, 2018
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Shear viscosity in two-dimensional dipole systems.
N E Djienbekov1, N Kh Bastykova1, A M Bekbussyn1
1Institute for Experimental and Theoretical Physics, Al-Farabi Kazakh National University, 71 Al-Farabi Avenue, 050040 Almaty, Kazakhstan.
Physical Review. E
|January 21, 2023
Summary
This study models shear viscosity in two-dimensional (2D) dipole systems using nonequilibrium molecular dynamics. Results reveal shear thinning and how screening affects viscosity, offering a universal scaling law.
Area of Science:
- Condensed Matter Physics
- Statistical Mechanics
- Computational Physics
Background:
- Understanding the rheological properties of systems with long-range interactions is crucial.
- Two-dimensional (2D) dipole systems exhibit complex behaviors influenced by interparticle correlations and screening effects.
- Shear flow in such systems can lead to non-Newtonian fluid behavior, including shear thinning.
Purpose of the Study:
- To model shear flows and calculate shear viscosity in 2D dipole systems.
- To investigate the impact of interparticle correlation regimes on viscosity.
- To analyze the effects of screening on viscosity and identify universal scaling laws.
Main Methods:
- Nonequilibrium molecular dynamics (NEMD) simulations were employed.
- Viscosity was calculated across various shear rates, from gaseous to liquid states.
- Simulations were performed for both bare and screened dipole-dipole interactions.
Main Results:
- Shear thinning was observed in 2D dipole systems at low coupling parameters.
- The presence of a screening medium can increase or decrease viscosity depending on interparticle correlation.
- A universal scaling law was derived for both bare and screened dipole-dipole interactions.
Conclusions:
- The study provides insights into the shear viscosity of 2D dipole systems under varying conditions.
- Screening effects significantly alter the rheological properties of these systems.
- The developed fitting curve offers a generalized approach to understanding viscosity scaling.
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