Permanent Strains in Clay-Like Material During Drying

Musielak, Grzegorz; Mierzwa, Dominik

doi:10.1080/07373930903041616

Cited by 26 publications

(12 citation statements)

References 30 publications

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“…The conditions under which this drying occurs are important in relation to both the final quality of the product and its waste due damage during the process. Defects occur because, during the drying processes, internal stresses are generated in the product due to the gradients of temperature and moisture [1][2][3][4][5][6][7][8]. In many situations, the loss of product is verified immediately after drying [7], or else the damage caused by the drying is only observed after burning [6].…”

Section: List Of Symbols a Nmentioning

confidence: 98%

“…Among these types the following can be cited: drying by microwave [9], drying through hot air [1,3,8,10], liquid desiccant drying method [4], radiation heating in an oven [5], convective-radiative drying [11] and superheated steam under pressure [12]. In some countries, like Brazil, hot air is normally used in the drying of ceramic products, despite the several types of drying available.…”

Section: List Of Symbols a Nmentioning

confidence: 99%

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Modeling of water transport in roof tiles by removal of moisture at isothermal conditions

et al. 2011

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The main objective of this article is to describe the drying process of ceramic roof tiles, shaped from red clay, using diffusion models. Samples of the product with initial moisture content of 0.24 (db) were placed inside an oven in the temperatures of 55.6, 69.7, 82.7 and 98.6°C; and the data of the drying kinetics were obtained. The analytical solutions of the diffusion equation for the parallelepiped with boundary conditions of the first and third kinds were used to describe the drying processes. The process parameters were determined using an optimization algorithm based on inverse method coupled to the analytical solutions. The analysis of the results makes it possible to affirm that the boundary condition of the third kind satisfactorily describes the drying processes. The values obtained for the convective mass transfer coefficient were between 8.25 9 10 -7 and 1.64 9 10 -6 m s -1 , and for the effective water diffusivity were between 9.21 9 10 -9 and 1.80 9 10 -8 m 2 s -1 . List of symbolsA n Coefficients of the analytical solution dependent on position (boundary condition of the third kind) B n Coefficients of the analytical solution for the average moisture content (boundary condition of the third kind) Bi Biot number (dimensionless) Bi 1 Biot number for the side of length L 1 (dimensionless) D Effective water diffusivity (m 2 s -1 ) h Convective mass transfer coefficient (m s -1 ) k, m, n Indexes of summations L 1 , L 2 , L 3 Dimensions of a parallelepiped (m) M Moisture content (kg kg -1 , dry basis) M(x, y, z, t) Moisture content at instant t in the position (x, y, z) (kg kg -1 , dry basis) M 0 Initial moisture content (kg kg -1 , dry basis) M eq Equilibrium moisture content (kg kg -1 , dry basis) MðtÞ Average moisture content at instant t (kg kg -1 , dry basis) M exp i Average moisture content of the ith experimental point (kg kg -1 , dry basis) M ana i Average moisture content determined by analytical solution (kg kg -1 , dry basis) R 2 Coefficient of determination (dimensionless) t Time (s) x, y, z Position in Cartesian coordinates (m)Greek symbols v 2 Chi-square or objective function l n Roots of the characteristic equation for boundary condition of the third kind r i Standard deviation of the ith experimental point

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Section: List Of Symbols a Nmentioning

confidence: 98%

Section: List Of Symbols a Nmentioning

confidence: 99%

Modeling of water transport in roof tiles by removal of moisture at isothermal conditions

et al. 2011

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“…For example, soils of different textures exhibit different volume change behavior when the pore-fluid properties or drying regime are altered, suggesting an interplay between these parameters (Musielak and Mierzwa, 2009;Péron et al, 2007). This has powerful implications, as soil texture and pore-fluid properties affect the depth, width, spacing, and shape of cracks (the manifestation of volume change at the fieldscale) which in turn influence the hydraulic/mechanical properties of the medium (Dane and Klute, 1977;Jozefaciuk et al, 2006;Lima and Grismer, 1992;McNeal et al, 1966;Musielak and Mierzwa, 2009;Oster and Schroer, 1979;Péron et al, 2007;Sartori et al, 1985;Waller and Wallender, 1993).…”

Section: Introductionmentioning

confidence: 96%

Assessing the role of the pore solution concentration on horizontal deformations in an unsaturated soil specimen during drying

et al. 2012

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“…[1,[4][5][6] The permanent deformations were experimentally investigated and reported in the literature. [6][7][8][9][10][11] As previously stated, every fracture is initiated in material if actual stresses reach the material strength. Hence, some works are devoted to localization problems.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Numerical Simulation of Clays Cracking During Drying

Musielak

Śliwa

2015

Drying Technology

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During drying or desiccation of clay-type materials, some stresses appear. Usually they are compressional inside of the material and tensional close to the surface. If the tensional stresses exceed the material strength, the clay cracks. This article is devoted to the modeling and numerical simulation of this phenomenon. The proposed model consists of two parts. The mass transfer is described by a simple diffusion equation together with convective boundary conditions. In the mechanical part it is assumed that the clay is composed of small particles linked together by cohesive forces. These forces are described with the use of mesh models. Two models are proposed: elastic (mesh consists of springs) and viscoelastic one (mesh consists of Maxwell elements). Four types of clays were tested experimentally to obtain the model parameters. The tested materials were selected with respect to different mineralogical compositions that determine the water-bonding ability. Simulations of the convective drying of bricks made of these clays were performed. It was shown that the degree of cracking depends on the quartz content of the clay. The obtained results were compared with experimental ones and good agreement between simulations and experiment was obtained. Additionally, the inner forces caused by drying are analyzed and discussed in this work.

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Permanent Strains in Clay-Like Material During Drying

Cited by 26 publications

References 30 publications

Modeling of water transport in roof tiles by removal of moisture at isothermal conditions

Modeling of water transport in roof tiles by removal of moisture at isothermal conditions

Assessing the role of the pore solution concentration on horizontal deformations in an unsaturated soil specimen during drying

Modeling and Numerical Simulation of Clays Cracking During Drying

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