Dynamic nonisothermal transport in hygroscopic porous media; Moisture diffusion in wood

Journal Article · Sat Aug 01 04:00:00 EDT 1992 · AIChE Journal (American Institute of Chemical Engineers); (United States)

DOI:https://doi.org/10.1002/aic.690380813· OSTI ID:7179368

Avramidis, S ^[1]; Englezos, P ^[2]; Papathanasiou, T ^[3]

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1. British Columbia Univ., Vancouver, BC (Canada)
2. British Columbia Univ., Vancouver, BC (Canada). Dept. of Chemical Engineering
3. Los Alamos National Lab., NM (United States)

In this paper, a model that predicts heat and moisture transfer in the hygroscopic range of a complex porous material such as wood, is evaluated with unsteady-state nonisothermal diffusion experimental data. Water chemical potential gradient was taken as the driving force for diffusion, and the derivation of the temperature-gradient phenomenological coefficient in the mass balance equation was based on the principles of nonequilibrium thermodynamics. The results reveal an excellent prediction of the specimen's average moisture content during desorption in the hygroscopic range.

• OSTI ID: 7179368
• Journal Information: AIChE Journal (American Institute of Chemical Engineers); (United States), Journal Name: AIChE Journal (American Institute of Chemical Engineers); (United States) Vol. 38:8; ISSN 0001-1541; ISSN AICEAC
• Country of Publication: United States
• Language: English

Related Subjects

09 BIOMASS FUELS
091000 -- Biomass Fuels-- Properties & Composition-- (1990-)
42 ENGINEERING
420400* -- Engineering-- Heat Transfer & Fluid Flow
661300 -- Other Aspects of Physical Science-- (1992-)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CALCULATION METHODS
DATA
DESORPTION
ENERGY TRANSFER
EQUATIONS
EQUATIONS OF STATE
EVALUATION
EXPERIMENTAL DATA
FLUID FLOW
HEAT TRANSFER
INFORMATION
MASS BALANCE
MATERIALS
MOISTURE
NUMERICAL DATA
POROUS MATERIALS
SORPTION
TEMPERATURE GRADIENTS
THERMODYNAMICS
UNSTEADY FLOW
WOOD