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Thermal rectification in three-dimensional mass-graded anharmonic oscillator lattices
M Romero-Bastida1, M Lindero-Hernández2
1SEPI ESIME-Culhuacán, Instituto Politécnico Nacional, Avenida Santa Ana No. 1000, Colonia San Francisco Culhuacán, Delegación Coyoacan, Distrito Federal 04440, Mexico.
Physical Review. E
|November 16, 2021
Summary
This study investigates thermal rectification efficiency in a 3D mass-graded anharmonic lattice. Maximum rectification was observed in a specific temperature range, outperforming 1D systems.
Area of Science:
- Condensed matter physics
- Thermodynamics
- Materials science
Background:
- Thermal rectification, or asymmetric heat flow, is crucial for thermal management.
- Understanding heat transport in low-dimensional and heterogeneous systems is an ongoing challenge.
Purpose of the Study:
- To investigate the thermal rectification efficiency of a three-dimensional mass-graded anharmonic lattice.
- To explore the influence of aspect ratio (W/N) on thermal rectification.
- To identify optimal temperature ranges for maximum rectification.
Main Methods:
- Nonequilibrium molecular dynamics (NEMD) simulations were employed.
- A three-dimensional mass-graded anharmonic lattice model was utilized.
- System dimensions (length N, width W) and aspect ratio were systematically varied.
Main Results:
- The 3D lattice exhibits thermal rectification comparable to 1D systems.
- Rectification saturates at low aspect ratios (W/N).
- Maximum rectification occurs in a unique temperature range, surpassing 1D models.
Conclusions:
- The 3D mass-graded anharmonic lattice demonstrates significant thermal rectification properties.
- Aspect ratio plays a key role in tuning rectification efficiency.
- The identified temperature range offers potential for novel thermal diode applications.
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