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Free-molecule heat transfer in a conservative force field between parallel surfaces
1Institute for Nano- and Microfluidics, Center of Smart Interfaces, Technische Universität Darmstadt, Germany.
Physical Review. E
|June 15, 2016
Summary
A conservative force field analytically modifies heat flux between parallel surfaces. This force field can reduce or enhance heat transfer, creating a thermal diode effect based on surface temperature ratios and boundary conditions.
Area of Science:
- Thermodynamics
- Statistical Mechanics
- Surface Physics
Background:
- Heat transfer between surfaces is crucial in many physical systems.
- Understanding particle transport under force fields is key to controlling thermal properties.
- Ballistic particle motion and Maxwell-type boundary conditions are fundamental concepts in kinetic theory.
Purpose of the Study:
- To analytically compute heat flux between parallel surfaces considering ballistic particle transport.
- To investigate the impact of a conservative force field on heat transfer.
- To explore the phenomenon of heat-flux rectification and its relation to thermal diodes.
Main Methods:
- Analytical computation of heat flux.
- Modeling particle transport under a conservative force field.
- Applying Maxwell-type boundary conditions for particle reflection.
- Investigating the influence of temperature ratios and accommodation coefficients.
Main Results:
- The force field can significantly reduce or enhance heat flux.
- Heat flux modulation depends on the ratio of surface temperatures.
- Accommodation coefficients play a role in heat transfer modulation.
- Asymmetry in force fields or boundary conditions leads to heat-flux rectification.
Conclusions:
- A conservative force field can control heat flux between parallel surfaces.
- The system exhibits thermal diode characteristics due to rectification.
- This work provides insights into designing materials with tunable thermal transport properties.
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