The moisture diffusion coefficient of a shrinking clay on drying

Evans, Albert; Keey, R.B.

doi:10.1016/0300-9467(75)88027-0

Cited by 7 publications

(4 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These values are very closed to those given by the literature (Collard [3], Evans and Keey [22]). The simulation is carried out on a flat matrix of 10 mm of thickness.…”

Section: Modelling Results and Discussionsupporting

confidence: 58%

“…In an isotropic medium where the coefficients D ij are identical in every direction, and by considering them constant, and in the case of a flat shape matrix where the flux of water diffusion is unidirectional and carried out according to the axis x 3 , the above equations are simplified (Crank [18], William and Callister [19], Shelby [20], Asheland [21], Evans and Keey [22]):…”

Section: Moisture Transfer By Diffusion: Diffusive Model For the Claymentioning

confidence: 99%

See 1 more Smart Citation

Experimental study of the drying and modelling of the humidity migration in a clay matrix

Atcholi

Vantomme

Perreux

2008

Int. J. Simul. Multidisci. Des. Optim.

View full text Add to dashboard Cite

-Available almost everywhere, therefore economic and even so durable, clays have stimulated the creativity of men who have imagined since millennia and under all latitudes, multiple processes to develop pottery (faïence enameled, porcelain, ceramics) and construction materials. These materials compete with modern materials in civil engineering for important construction works such as bridges, roads, tunnels, monuments etc. In state-of-the-art technologies, clay ceramics are used as anti-thermal coatings: turbine vanes, etc... The weakness of our scientific knowledge limits applications of these natural materials. This study on tropical clays, has for objective on one hand to develop new processing of construction materials for lodging needs that are more and more increasing in the developing countries, and the other hand to develop new refractory materials, anti-thermal coatings or ceramic prostheses. This study is part of a research program and academic cooperation between the laboratories LMARC-Besançon/France, LERMPS-Belfort/France, Civil Eng. Dept./ERM-Bruxelles/Belgique, URMA-Lomé/Togo (K.-E. Atcholi, Rapport d'activités de Recherches, Université de Lomé, Février 1997). In this paper, we present an experimental modelling of a clay matrix drying in order to better understand and resolve material deformations and cracking. The complex behaviour of the clay during drying, leads us to propose two complementary approaches: an experimental approach that allows to establish the drying kinetic and a modelling of moisture transfer in a clay matrix in order to optimise the drying. A diffusive model based on Fick's laws allowed to highlight the internal stresses causing matrixes damage.

show abstract

“…These values are very closed to those given by the literature (Collard [3], Evans and Keey [22]). The simulation is carried out on a flat matrix of 10 mm of thickness.…”

Section: Modelling Results and Discussionsupporting

confidence: 58%

Section: Moisture Transfer By Diffusion: Diffusive Model For the Claymentioning

confidence: 99%

Experimental study of the drying and modelling of the humidity migration in a clay matrix

Atcholi

Vantomme

Perreux

2008

Int. J. Simul. Multidisci. Des. Optim.

View full text Add to dashboard Cite

show abstract

“…In practice unidirectional shrinkage occurs only under special conditions such as drying of some polymers and drying of a thin constrained film [Scherer, 1987]. In literature, however, the unidirectional shrinkage model is encountered quite often [Evans et al, 1975;Coumans, 1987;Kechaou et al, 1988], mainly because the transformation of the space coordinate is not difficult and can be found in various references [e.g. Crank, 1956;Philip, 1969].…”

Section: Unidirectional Shrinkagementioning

confidence: 99%

Drying Deformable Media Kinetics, Shrinkage and Stresses

Ketelaars

1994

Drying Technology

View full text Add to dashboard Cite

“…Fick's laws of diffusion and Fourier's law of conduction as well as its derived equation (e.g. Thin-layer drying equation) account for a significant proportion of the mathematical models employed in clay science (Evans and Keey, 1975;Tomas, et al, 1993;Kanno, et al, 1996;Su 1997;Sander, et al, 1998Sander, et al, , 2001Sander, et al, , 2003Moropoulou, et al, 2004Moropoulou, et al, , 2005Murugesan, et al, 2001;Mihoubi, et al, 2004;Dincer and Sahin, 2004;Akpinar and Dincer, 2005;;Chemkhi, et al, 2004Chemkhi, et al, , 2005. However, many of these models include different moisture transfer parameters that have a wide variation of reported values, depending on the complexity of the product and methods of moisture estimation.…”

Section: Introductionmentioning

confidence: 99%

Moisture Desorption Studies on Polymer Hydrated and Vacuum Extruded Bentonite Clay Mat

Loh

Wijeyesekera

Ciupala

2016

Journal of Heat Transfer

View full text Add to dashboard Cite

Moisture desorption observations from two bentonite clay mats subjected to ten 26 environmental zones with individually different combinations of laboratory controlled constant 27 temperatures (between 20⁰C to 40⁰C) and relative humidity (between 15% to 70%) are presented. 28These laboratory observations are compared with predictions from mathematical models, such as 29Thin-layer drying equations and kinetic drying models proposed by Page, Wang and Singh, and 30Henderson and Pabis. The quality of fit of these models is assessed using standard error of 31 estimate, relative percent of error and coefficient of correlation. The Page model was found to 32 better predict the drying kinetics of the bentonite clay mats for the simulated tropical climates. 33Critical study on the drying constant and moisture diffusion coefficient help to assess the efficacy 34 of a polymer to retain moisture and control desorption through water molecule bonding. This is 35 further substantiated with the Guggenheim-Aderson-DeBoer (GAB) desorption isotherm model 36 which is presented. 37 38

show abstract

The moisture diffusion coefficient of a shrinking clay on drying

Cited by 7 publications

References 2 publications

Experimental study of the drying and modelling of the humidity migration in a clay matrix

Experimental study of the drying and modelling of the humidity migration in a clay matrix

Drying Deformable Media Kinetics, Shrinkage and Stresses

Moisture Desorption Studies on Polymer Hydrated and Vacuum Extruded Bentonite Clay Mat

Contact Info

Product

Resources

About