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La Société Française de Thermique a pour objectif le développement et le rayonnement des sciences thermiques et énergétiques et de leurs applications. Cette année 2025, le 33e Congrès Français de Thermique s’est déroulé du 3 au 6 juin 2025 à Chambéry sur le thème Thermique, Energies renouvelables et Territoires.
We describe a new nodal simulation approach, and a corresponding theoretical model, to quantify thermal conduction through the solid phase in three-dimensional fibrous networks, with the impact of fiber-to-fiber thermal contact resistances. We demonstrate that the solid thermal conductivity can be calculated by a master curve, based solely on geometric parameters of the medium, particularly in the case of low-connectivity. This provides a powerful predictive tool to be applied to the study of real insulation materials, to develop in particular optimization strategies based on structural parameters.
Measuring temperature fields in semi-transparent media requires the knowledge of optothermal properties. While current techniques are well established for isothermal thin films, they remain unexplored for thick films with temperature gradients. This study proposes to generalize current methods to thick media by combining transmittance measurement based on transmission heterodyne photothermal imaging (TPHI) and optothermal modeling. In this work, we demonstrate the validity of our model, followed by the measurements of thermotransmittance and thermoreflectance coefficients for 3 different materials.
Local Climate Zones (LCZs) classify urban areas based on their morphology and thermal properties. Using the WUDAPT Level 0 methodology, this study develops an LCZs map for Lyon by leveraging satellite imagery and open-source tools. The process involves collecting training data, performing classification, and validating results. The LCZs map reveals Lyon’s diverse urban structures, offering valuable insights for climate studies and sustainable urban planning. This study highlights the utility of LCZs datasets in addressing challenges posed by urbanization and climate change.
The behavior of pool fires and the ignition risk of unburnt gases are analyzed in a reduced-scale model of a ventilated historic chamber. Experiments were carried out with various pool diameters and air exchange rates to examine fire behavior in a confined environment. The results show that fire behavior varies depending on the combustion regime. The risk assessment, based on a global approach, indicates that the largest pool fire presents a high ignition risk, while the smallest remains below the ignition threshold. This study provides perspectives for fire safety in historic buildings.
A highly turbulent natural convection flow $$$Ra=\mathrm{1,\!2\times10^{11}}$$$ is generated within a differentially heated cavity. The objective of this work is to experimentally characterize the effects of radiation on this flow in the median vertical plane of the cavity. Measurements of thermal stratification and velocity are performed.
2025
Volume 25- 6
Issue 12024
Volume 24- 5
Special issue LILA 22023
Volume 23- 4
Issue 12022
Volume 22- 3
Issue 12021
Volume 21- 2
Special issue2020
Volume 20- 1
Issue 1