Abstract
Recent work discloses shortcomings in models for heat transport properties. Some errors involve simple numerical factors, but others are substantial, such as not accounting for the finite lifetimes of interactions, nor weighting thermal conductivity in summations, nor realizing that thermal diffusivity depends on thickness. This chapter discusses the consequences in view of the ambiguities contributed by multiplied parameters in models, and provides an improved model for heat transport in solids. We show that radiative diffusion describes all heat transfer, when the association of various processes in matter with limited frequency ranges of light is addressed. Dimensionless thermal conductivity of solids from 0 to ~300K, including the cryogenic peak, is fit by one parameter; but including high temperature data requires more. Theoretical pressure derivatives agree well with reliable data. To better understand heat transport requires measuring transport properties as a function of length and spectra at low frequencies and temperatures.
| Original language | English |
|---|---|
| Title of host publication | Measurements, Mechanisms, and Models of Heat Transport |
| Publisher | Elsevier |
| Pages | 359-398 |
| Number of pages | 40 |
| ISBN (Electronic) | 9780128099810 |
| ISBN (Print) | 9780128099827 |
| DOIs | |
| State | Published - Jan 1 2018 |
Keywords
- Attenuation
- Inelasticity
- Integral formulation
- Lifetimes
- Mean free paths
- Radiative diffusion
- Refraction
- Speeds
- Summations
- Vibrations