|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Thermal Property Characterization, Modeling, and Theory in Extreme Environments
||A Thermodynamically-consistent Model for Heat Transport in Heterogeneous Solids
||Karim Ahmed, Fergany Badry
|On-Site Speaker (Planned)
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.