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A Novel Method for In Situ Electromechanical Characterization of Nanoscale Specimens
Published on: June 2, 2017
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Revealing nanoscale slip within Taylor-Aris dispersion
1Department of Civil and Environmental Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA. gjwang@cmu.edu.
Nanoscale
|March 6, 2025
Summary
Hydrodynamic slip at fluid interfaces connects microscopic slip velocity to macroscopic Taylor-Aris dispersion. This finding allows slip velocity inference from molecular self-diffusivities, crucial for confined fluid transport.
Area of Science:
- Fluid dynamics
- Interface science
- Transport phenomena
Background:
- Hydrodynamic slip at fluid-solid interfaces is critical for transport in confined systems.
- Existing research primarily focuses on the microscopic origins of slip.
Purpose of the Study:
- To connect microscopic slip velocity with macroscopic Taylor-Aris dispersion.
- To enable slip velocity to be expressed in terms of macroscopic dispersion.
- To extend continuum treatment of dispersion to systems with length scales comparable to slip length.
Main Methods:
- Extensive molecular-dynamics simulations.
- Studied simple and polymeric fluids.
- Varied thermodynamic and geometric conditions.
Main Results:
- Established a direct link between microscopic slip velocity and macroscopic Taylor-Aris dispersion.
- Demonstrated the applicability of continuum Taylor-Aris dispersion theory to systems with small confining length scales.
- Showed that slip velocity can be accurately inferred from molecular self-diffusivities.
Conclusions:
- The macroscopic Taylor-Aris dispersion provides a framework for understanding microscopic slip.
- Slip velocity can be quantified using equilibrium and shear-augmented molecular self-diffusivities.
- This work bridges microscale slip phenomena with macroscale transport descriptions.
