Open AccessOn the importance of heat and mass transfer coupling during characterization of hygroscopic insulation materials
Author(s) -
Patrick Pérré,
Arnaud Challansonnex
Publication year - 2018
Language(s) - English
Resource type - Conference proceedings
DOI - 10.4995/ids2018.2018.7884
Subject(s) - thermal diffusivity , mass transfer , transient (computer programming) , characterization (materials science) , work (physics) , materials science , coupling (piping) , heat transfer , diffusion , thermal conductivity , thermodynamics , thermal , mechanics , composite material , physics , computer science , nanotechnology , operating system
The present work is focused on mass transfer characterization of hygroscopic materials used for insulation, such as Low Density Fibreboards. Due to their particular morphology, these panels present a very high mass diffusivity in the connected gaseous phase and a very low thermal conductivity. This combination of properties exacerbates the coupling between heat and mass transfer in transient state. Based on experimental data obtained with an original set-up and relevant simulations performed using a comprehensive physical formulation, a throughout vision of this question is proposed in the present study. In particular, we emphasize on: - The impressive change in core temperature in terms of magnitude and duration, - The great impact of the internal temperature gradient, which slows down mass diffusion, - The dramatic error on mass diffusivity value if the coupling is ignored. Keywords: experiment; identification; modelling; RH at back-face; transient state