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International Heat Transfer Conference 15

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

Convective to Diffusive Contribution of Mass Transfer in Porous Building Materials through Peclet Number Evaluation

DOI: 10.1615/IHTC15.pmd.009774
pages 6731-6744

Kamilia Abahri
ENS Cachan

Rafik Belarbi
Laboratory LEPTIAB La Rochelle University, France

Rachid Bennacer
L2MGC F-95000, University of Cergy-Pontoise, 95031 Cergy-Pontoise Cedex, Paris, France; ENS-Cachan Dpt GC/LMT/CNRS UMR 8535, 61 Ave. du Président Wilson, 94235 Cachan Cedex, France; Tianjin Key Lab of Refrigeration Technology, Tianjin University of Commerce, 300134

Liu Bin
Tianjin Key Lab of Refrigeration Technology, Tianjin University of Commerce


KEY WORDS: Porous media, Mass transfer and drying, Combined heat and mass transfer

Abstract

The interest of this paper lays to exanimate the contribution of two main mechanisms: moisture convection and diffusion on HAM (Heat Air and Moisture) transfer in porous building envelopes and to define the validity of the sub-models. Heat transfer is considered in the strongly coupled situation where the mass and heat flux are temperature, total pressure and moisture content dependents. Based on this model, a numerical simulation is performed and focuses on one-dimensional problem for drying test boundary conditions. Temperature and moisture content profiles have been predicted as function of time versus the corresponding physics. Moreover, a detailed parametric analysis was carried out in order to investigate the influence of typical governing parameters over the range of 0.1 Pe  50 , 0.001 Lu 13 , 0.005  Bu 100 , 0.05  Pn  2 , 2  Ko  30 and 0.01 Lup 100 . Results show that convection becomes a prominent driving potential face to the diffusion process when the hygric state is quite stable between the ambiance and the envelope. Thought, at high Pe number convection favors drying comparing to the pure diffusion process.

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