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Characterization of Thermal Transport in One-dimensional Solid Materials
Published on: January 26, 2014
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Vibrational model of thermal conduction for fluids with soft interactions
1Joint Institute for High Temperatures, Russian Academy of Sciences, 125412 Moscow, Russia and Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt (DLR), 82234 Weßling, Germany.
Physical Review. E
|February 19, 2021
Summary
This study presents a vibrational model for heat transfer in liquids, accurately predicting results for Lennard-Jones liquids and one-component plasmas. The model effectively captures thermal conductivity but not momentum transfer or viscosity.
Area of Science:
- Thermodynamics
- Condensed Matter Physics
- Statistical Mechanics
Background:
- Understanding heat transfer mechanisms in liquids is crucial for various scientific and engineering applications.
- Previous models often struggle to accurately capture thermal transport properties in dense liquids and plasmas.
Purpose of the Study:
- To develop and validate a vibrational model for heat transfer in simple liquids.
- To investigate the applicability of this model to specific systems like Lennard-Jones liquids and one-component plasmas.
Main Methods:
- Derivation of a general expression for heat transfer based on vibrational dynamics.
- Averaging the expression over the liquid collective mode excitation spectrum.
- Application and testing of the model against numerical simulations.
Main Results:
- The vibrational model successfully quantifies heat transfer in dense Lennard-Jones liquids.
- Remarkable agreement was found between the model's predictions and existing numerical data for one-component plasmas.
- The model's applicability was limited, not extending to momentum transfer or shear viscosity.
Conclusions:
- A novel vibrational model provides an accurate description of heat transfer in certain liquid systems.
- The model highlights the distinct mechanisms governing thermal conductivity versus transport properties like viscosity.
- Further research may be needed to extend vibrational models to other liquid transport phenomena.
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