Modeling the convection-radiation coupling in porous materials and identification of their radiation characteristics: Application to glass wools
Abstract
A coupled convection-radiation heat transfer model is developed. The case of a rectangular cavity filled with porous materials having two isothermal walls and two adiabatic walls is considered. The radiation is studied assuming a two flow finite difference model. The determination of the radiation parameters of semitransparent bodies is also studied, based on the two directional spectral transmittance. The results obtained using pure silica fibers are presented. The role played by radiation is highlighted, showing its contribution of 25% heat loss for low temperature heat insulators and 55% for the case of high temperature insulators.
- Publication:
-
Ph.D. Thesis
- Pub Date:
- 1986
- Bibcode:
- 1986PhDT..........U
- Keywords:
-
- Convective Heat Transfer;
- Glass Fibers;
- Porous Materials;
- Radiative Heat Transfer;
- Thermal Insulation;
- Thermodynamic Efficiency;
- Coupled Modes;
- Mathematical Models;
- Parameterization;
- Fluid Mechanics and Heat Transfer