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Updated: Jan 17, 2026
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An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
Published on: December 4, 2017
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Irreversibility of mesoscopic processes with hydrodynamic interactions
Biswajit Das1, Sreekanth K Manikandan2, Shuvojit Paul1
1Indian Institute of Science Education and Research Kolkata, Department of Physical Sciences, Mohanpur Campus, Mohanpur, West Bengal 741246, India.
Physical Review. E
|September 16, 2025
Summary
Hydrodynamic interactions in colloidal systems influence irreversibility. Coarse graining reveals that these interactions do not violate energy balance and can reverse entropy production dependencies in nonequilibrium systems.
Area of Science:
- Soft matter physics
- Statistical mechanics
- Non-equilibrium thermodynamics
Background:
- Colloidal particles form coupled systems via hydrodynamic interactions.
- The role of these interactions in irreversibility and energy dissipation in out-of-equilibrium systems is not fully understood.
Purpose of the Study:
- To investigate how hydrodynamic interactions affect nonequilibrium features.
- To explore the influence of external driving and coarse-graining on entropy production.
- To clarify the impact of hydrodynamic interactions on energy balance.
Main Methods:
- Estimation of entropy production rate.
- Analysis of optically confined colloidal particle systems.
- Varying external driving and levels of coarse graining.
Main Results:
- Nonequilibrium features depend on external driving and coarse-graining level.
- Coarse-graining reverses the entropy production rate's dependence on hydrodynamic interaction strength.
- Hydrodynamic interactions do not violate energy balance at the individual trajectory level.
Conclusions:
- Coarse-graining has a significant, previously unnoticed effect on nonequilibrium systems.
- Hydrodynamic interactions are crucial for understanding entropy production in colloidal systems.
- Results have implications for inferring entropy production in experimental settings.
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