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Thermal diode utilizing asymmetric contacts to heat baths
Teruhisa S Komatsu1, Nobuyasu Ito
1Department of Applied Physics, The University of Tokyo, Hongo, Bunkyo, Tokyo 113-8656, Japan.
Summary
We developed a passive thermal diode that rectifies heat current using size-asymmetric contacts. This device effectively blocks heat flow when the narrower contact is hotter, acting as a thermal switch.
Area of Science:
- Thermodynamics
- Nanoscale science
- Materials science
Background:
- Heat current rectification is crucial for thermal management.
- Existing thermal diodes often require active control or complex structures.
- Developing passive, efficient thermal rectifiers is an ongoing challenge.
Purpose of the Study:
- To propose and simulate a simple, passive thermal diode.
- To demonstrate heat current rectification using size asymmetry and a liquid medium.
- To investigate the mechanism of thermal insulation in the diode.
Main Methods:
- Simulations of nanoscale systems.
- Utilizing a liquid heat-conducting medium with induced gas-like regions.
- Varying contact area size asymmetry and temperature conditions.
Main Results:
- Demonstrated passive rectification of heat current.
- Observed effective heat flow cutoff when the narrow contact is hotter.
- Identified the formation of an insulating gas-like region as the key mechanism.
Conclusions:
- The proposed thermal diode offers a simple and passive solution for heat current rectification.
- Size asymmetry is a critical design parameter for achieving thermal rectification.
- The induced gas-like region effectively functions as a tunable thermal insulator.
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