Title: Validation of a coupled heat, vapour and liquid moisture transport model for porous materials implemented in CFD
Authors: Van Belleghem, Marnix ×
Steeman, Marijke
Janssen, Hans
Janssens, Arnold
De Paepe, Michel #
Issue Date: Dec-2014
Publisher: Pergamon Press
Series Title: Building and Environment vol:81 pages:340-353
Abstract: Moisture-related damage is an important issue when looking at the performance of building envelopes.
In order to accurately predict the moisture behaviour of building components, building designers can
resort to Heat, Air and Moisture (HAM) models. In this paper a newly developed heat and mass transfer
model that is implemented in a 3D finite volume solver, Fluent®, is presented. This allows a simultaneous
modelling approach of both the convective conditions surrounding a porous material and the heat and
moisture transport in the porous material governed by diffusion. Unlike most HAM models that often
confine to constant convective transport coefficients it is now possible to better predict these convective
boundary conditions. An important application of the model is the convective drying of porous building
materials. Especially during the first drying stage, the drying rate is determined by the convective
boundary conditions. The model was validated against a convective drying experiment from literature, in
which a saturated ceramic brick sample is dried by flowing dry air over one side of the sample surface.
Temperature and relative humidity measurements at different depths in the sample, moisture distribution
profiles and mass loss measurements were compared with simulation results. An overall good
agreement between the coupled model and the experiments was found, however, the model predicted
the constant drying rate period better than the falling rate period. This was improved by adjusting the
material properties. The adjustment of the material properties was supported by neutron radiography
ISSN: 0360-1323
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Building Physics Section
× corresponding author
# (joint) last author

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