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Experimental Methodology for Estimation of Local Heat Fluxes and Burning Rates in Steady Laminar Boundary Layer Diffusion Flames
Published on: June 1, 2016
Equilibrium calculations of viscosity and thermal conductivity across a solid-liquid interface using boundary
Janka Petravic1, Peter Harrowell
1School of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia.
Equilibrium boundary fluctuation theory accurately predicts interfacial properties like slip length and thermal conductivity in Lennard-Jones systems. Nonequilibrium simulations confirm these findings, validating linear response behavior.
Area of Science:
- Thermodynamics
- Materials Science
- Computational Physics
Background:
- Interfacial properties significantly influence material behavior.
- Accurate calculation of viscosity and thermal conductivity is crucial for understanding fluid dynamics and heat transfer.
- Boundary fluctuation theory offers a novel approach to equilibrium calculations.
Purpose of the Study:
- To calculate viscosity and thermal conductivity in Lennard-Jones systems with coexisting solid-liquid phases.
- To compare equilibrium boundary fluctuation theory results with nonequilibrium molecular dynamics.
- To investigate the wetting properties' effect on interfacial characteristics.
Main Methods:
- Utilized equilibrium boundary fluctuation theory for calculations.
- Employed nonequilibrium molecular dynamics for comparison.
- Analyzed systems of Lennard-Jones particles with varying interface wetting properties.
Main Results:
- Equilibrium and nonequilibrium calculations showed good agreement for slip length and thermal equivalent lengths.
- Nonequilibrium simulations were found to probe the linear response regime.
- Intrinsic equivalence length showed significant dependence on interfacial temperature difference.
Conclusions:
- Equilibrium boundary fluctuation theory is a reliable method for predicting interfacial properties.
- The observed dependence of equivalence length is due to differing thermodynamic states of the interfaces.
- The study validates the use of linear response theory in these simulations.
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