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Diffusivity of Moisture in Thin Films
20th International Reliability Physics Symposium, 1982Absorption of moisture by thin films produces a volume increase which changes the film stress toward compression. This effect is the basis of a new technique for measuring water diffusivity. The diffusion coefficient is determined by a least squares fit of the stress data to the diffusion equation, with appropriate boundary conditions.
Edward J. McInerney, Paul A. Flinn
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Holz als Roh- und Werkstoff, 1998
The diffusion model based on Fick's second law has been used to predict the moisture movement in nonsteady state. However, the diffusion coefficient generally is not a constant. The diffusion equation origins from well-known heat transfer theory. In the case of moisture movement, moisture below fiber saturation point should be considered to have some ...
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The diffusion model based on Fick's second law has been used to predict the moisture movement in nonsteady state. However, the diffusion coefficient generally is not a constant. The diffusion equation origins from well-known heat transfer theory. In the case of moisture movement, moisture below fiber saturation point should be considered to have some ...
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Determiination of moisture diffusivity in porous media using moisture concentration profiles
International Journal of Heat and Mass Transfer, 1996A procedure is presented to determine the moisture diffusivity for drying from measured moisture concentration profiles. From error analysis it is shown that the applied space grid for scanning and the one-dimensional resolution of the NMR (nuclear magnetic resonance) method used for the measurements had a minor influence on the accuracy of the ...
Pel, L., Brocken, H.J.P., Kopinga, K.
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Oxygen Diffusion Characteristics of Gas Diffusion Layers With Moisture
ASME 2008 6th International Conference on Nanochannels, Microchannels, and Minichannels, 2008The mass transfer characteristics of the gas diffusion layer (GDL) in a polymer electrolyte fuel cell (PEFC) are closely related to the performance. In this study, the oxygen diffusivity of paper and cloth type porous media, which are generally used as GDLs, were measured with respect to liquid water content, using experimental apparatus consisting of ...
Daigo Iwasaki +3 more
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Moisture Diffusivity in Forest Fuels
International Journal of Wildland Fire, 1992Abstract. Apracticalmeans of quanmingthe diffusivities of forest fuels from fielddata is presented. The mathematics of this method is explored for four fuel shapes: a litter layer, a hardwood leaf, a twig and a square fuel moisture analogue stick, which are represented geometrically by a semi-infinite solid, a slab, a cylinder and a square prism ...
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Coupled diffusion of temperature and moisture
1986The interdependence of heat and moisture in solids has been discussed in [1–3]. It was demonstrated [3] that the effective diffusion constants measured in typical experiments [4] are equal to the diffusion coefficients of the material only in the case of very weak coupling.
G. C. Sih, J. G. Michopoulos, S. C. Chou
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Dynamics of moisture diffusivity in solid triacylglycerol matrices
Food Research International, 2015The effects of lipid formulation in combination with two crystallization conditions, shearing and non-shearing, on the mechanism of water diffusivity were investigated. Five formulations of lipid which varied in fatty acid compositions, solid fat particles, and emulsifier levels were assessed at 5, 20, and 30°C.
Quynh, Duong +2 more
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DIFFUSIVE TRANSPORT OF RADON IN A COLUMN OF MOISTURIZED SAND
Health Physics, 1999Diffusive transport of radon in a moisturized sand column was investigated under well-defined and controlled conditions using a laboratory facility that consists of a cylindrical vessel (height and diameter 2 m) filled with sand. Equilibrium pore-gas radon-concentration profiles in the sand column were measured as a function of depth for several ...
W H, van der Spoel +2 more
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Simulating moisture diffusion in polymers using thermal-moisture analogy
2016 17th International Conference on Thermal, Mechanical and Multi-Physics Simulation and Experiments in Microelectronics and Microsystems (EuroSimE), 2016The present paper illustrates moisture diffusion using advanced thermal-moisture analogy approach. Experimental procedure to measure the diffusivity and solubility of epoxy based encapsulation material to be implemented in simulation has been discussed. The moisture weight gain of the sample is measured till its saturated state over time at 5 different
Arun Sasi, Przemyslaw Gromala
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The diffusion of moisture in sorbent solids—I. Diffusion cell and pore diffusion
Journal of the Franklin Institute, 1977Abstract A complete theory of diffusion of absorbing gases in porous solids is developed. Both ordinary and thermal diffusion are considered. The thermodynamics of irreversible processes is used to derive the general flux equations. A new theoretical model of surface diffusion is presented.
Stanley H Jury +2 more
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