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Marion BEAUMALE of GREPHE group awarded the Prix Biot-Fourier at Congrès Français de Thermique 2021

par Laurence Laffont - publié le , mis à jour le

The 29th Congrès Français de Thermique (French Congress of Thermics) took place on June 1st, 2nd and 3rd, 2021 in Belfort, organized by Bourgogne Franche-Comté University.
During this congress, Marion BEAUMALE, doctoral student at LAPLACE supervised by Pascal LAVIEILLE and Marc MISCEVIC, on a CIFRE grant financed by the company EPSILON, won the Biot-Fourier Prize awarded by the French Society of Thermics (SFT).
The Biot-Fourier Prize rewards each year the best scientific contribution taking into account its originality.
Marion BEAUMALE’s thesis work entitled "Effet de la gravité sur la condensation convective : de l’analyse locale à l’établissement de lois de dimensionnement" (Effect of gravity on convective condensation : from local analysis to the establishment of dimensioning laws) was carried out with LAPLACE’s team GREPHE.
The project was supported by the European Space Agency (ESA).
The objective was to understand the mechanisms governing convective condensation at low mass flow in order to propose sizing laws taking into account the effect of gravity in explicit ways. These laws can be used in terrestrial environment as well as in reduced gravity situation (such as Martian atmosphere) or in microgravity.
The proposed experimental device allows to measure locally and simultaneously the thickness of a liquid trickling film and the associated heat transfer coefficient when this film is fed by the condensation of a vapor. Due to the cooling mode used (i.e. forced air convection) and the material constituting the condenser (i.e. sapphire), the determination of the heat transfer coefficient requires the implementation of a non-intrusive metrology leading to an extreme accuracy on the measurement of the wall temperature.
This worked around on the development of a specific measurement protocol allowing the determination of this temperature with high precision (0.05 °C) by infrared camera. This original method allows to reduce the uncertainty of more than one order of magnitude by freeing itself from the biases related to the camera, the reflections of the environment and the semi-transparent character of the wall of the condenser and the liquid phase.
The details of the method can be found in the paper :
Beaumale M., Lavieille P., Miscevic M., High precision infrared metrology for the determination of transfer coefficients in convective condensation, 29th French Congress of Thermics, SFT2021, Belfort, June 2021.

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