| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Thermal Property Characterization, Modeling, and Theory in Extreme Environments
|
| Presentation Title |
A Thermodynamically-consistent Model for Heat Transport in Heterogeneous Solids |
| Author(s) |
Karim Ahmed, Fergany Badry |
| On-Site Speaker (Planned) |
Karim Ahmed |
| Abstract Scope |
A novel model for heat conduction in heterogeneous solids was developed based on the thin-interface description of interfaces. In contrast to existing models, our new model treats an interface as an autonomous “phase” with its own thermal conductivity. The Kapitza resistance/conductance of a thin interface is then derived in terms of the interface thermal conductivity and width. This treatment allows the model to simulate the change of Kapitza resistance/conductance with segregation/doping, interface structure/phase transition, or interface decohesion. Additionally, it is shown that when non-local effects are included in Fourier’s law, the size dependent conductivity and thermal rectification phenomena can be explained in a unified manner. Moreover, since the model assumes a finite width for interfaces, it is expected to give better predictions than its sharp-interface-based counterparts for nanocrystalline solids. High-fidelity finite-element simulations were conducted to validate the predictions of the new model and proved its higher accuracy. |
| Proceedings Inclusion? |
Planned: |