Validation of a parietal heat transfer model in a constant volume spherical vessel
Résumé
This work aims to numerically estimate the parietal heat flux in various thermal systems, such as the spherical combustion chamber at constant volume. We estimate mainly the convective heat coefficient using a new approach based on the kinetic theory of gas instead of existing macroscopic models. In this configuration, which is marked by high pressures and temperatures, assessing the wall heat flux presents an important challenge. This study employs a transient heat transfer model derived from an innovative application of kinetic theory of gases to elucidate conduction phenomena between gas particles and a cold wall at short scales. We want to analyze and evaluate heat exchange at the wall by modeling the interactions between the flame and the wall, as well as the burned gas and the wall, using an unsteady thermal transfer model implemented in FORTRAN code. Numerical results of time evolution of pressure and heat flux in different operating conditions were illustrated and compared to the experimental ones to validate the approach.