“TIMAwave” an innovative test platform for thermal diffusivity measurements of solid materials at high temperature

2017 ◽  
Author(s):  
Dan R. Wargulski ◽  
Mohamad Abo Ras ◽  
Daniel May ◽  
Bernhard Wunderle
Keyword(s):  
High Temperature ◽  
Thermal Diffusivity ◽  
Solid Materials ◽  
Diffusivity Measurements ◽  
Test Platform

scholarly journals Uncertainty Assessment for Very High Temperature Thermal Diffusivity Measurements on Molybdenum, Tungsten and Isotropic Graphite

2021 ◽  
Vol 43 (1) ◽  
Author(s):  
Bruno Hay ◽  
Olivier Beaumont ◽  
Guillaume Failleau ◽  
Nolwenn Fleurence ◽  
Marc Grelard ◽  
...  
Keyword(s):  
High Temperature ◽  
Thermal Diffusivity ◽  
Laser Flash ◽  
Uncertainty Assessment ◽  
National Metrology Institute ◽  
Thermal Diffusivity Measurement ◽  
Uncertainty In Measurement ◽  
Diffusivity Measurements ◽  
Very High ◽  
Isotropic Graphite

AbstractThe French National Metrology Institute LNE has improved its homemade laser flash apparatus in order to perform accurate and reliable measurements of thermal diffusivity of homogeneous solid materials at very high temperature. The inductive furnace and the associated infrared (IR) detection systems have been modified and a specific procedure for the in situ calibration of the used radiation thermometers has been developed. This new configuration of the LNE’s diffusivimeter has been then applied for measuring the thermal diffusivity of molybdenum up to 2200 °C, tungsten up to 2400 °C and isotropic graphite up to 3000 °C. Uncertainties associated with these high temperature thermal diffusivity measurements have been assessed for the first time according to the principles of the “Guide to the Expression of Uncertainty in Measurement” (GUM). Detailed uncertainty budgets are here presented in the case of the isotropic graphite for measurements performed at 1000 °C, 2000 °C and 3000 °C. The relative expanded uncertainty (coverage factor k = 2) of the thermal diffusivity measurement is estimated to be between 3 % and 5 % in the whole temperature range for the three investigated refractory materials.

scholarly journals Improvement of the photoacoustic response in thermal diffusivity measurements

2020 ◽  
Vol 3 (4) ◽  
pp. 196-205
Author(s):  
David Gasca-Figueroa ◽  
Micael Gerardo Bravo-Sánchez ◽  
Adriana Guzmán-López ◽  
José Guadalupe Zavala-Villalpando ◽  
Francisco Javier García-Rodríguez
Keyword(s):  
Mathematical Model ◽  
Thermal Properties ◽  
Thermal Diffusivity ◽  
Room Temperature ◽  
Heat Energy ◽  
Photoacoustic Cell ◽  
Solid Materials ◽  
Diffusivity Measurements ◽  
Materials Used

An alternative photoacoustic cell configuration for the determination of the thermal diffusivity (α), at room temperature, for solid materials is presented. The method is based on the use of two identical photoacoustic chambers, inside both of them, a metallic foil thermally thin is used to transform the light energy to heat energy.  A Reference material placed parallel to a study material allows to relate the thermal properties of the materials used as support in the photoacoustic chambers of the experimental arrangement presented here. The ratio between experimental and theoretical photoacoustic amplitudes is realized to validate a proposed mathematical model.

Sign in / Sign up

Export Citation Format

Share Document