Drying of gelcast ceramic parts via the liquid desiccant method

Barati, Aboulfazl; Kokabi, Mehrdad; Famili, Mohammad Hossein Navid

doi:10.1016/s0955-2219(03)00045-1

Cited by 61 publications

(40 citation statements)

References 9 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: 99%

“…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: 99%

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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“…The porous α-alumina tubular membrane supports (diameter, length and thickness were 12, 70 and 3.2 mm, respectively) were prepared by the gel casting method [31][32][33] . Before synthesis of the silica membrane layers, surface modification was necessary to reduce the support's pore size to 5-10 nm due to the silica layer formation 34 .…”

Section: Synthesis Of the Supports And Intermediate Layersmentioning

confidence: 99%

Synthesis and Performance of Nanostructure Templated Silica Membranes Surface-modified by Two Different Procedures

Assa¹

2015

Chem. Biochem. Eng. Q.

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“…Some authors (Amoros et al 2003;Barati et al 2003) have shown how the properties of semimanufactures of ceramics depend on the moisture of substance and drying time. They have determined that the drier material is, and at the same time drying will be held for a longer time (three and more days at the maximum temperature of about 100 °C), the greater mechanical strength is obtained.…”

Section: Introductionmentioning

confidence: 99%

The Regulation of Structural Parameters of Ceramics Depending on the Drying Regime

Mačiulaitis

Malaiškienė

2009

Journal of Civil Engineering and Management

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Abstract. Always in the shaped semimanufactures of ceramics is some humidity, which we must eliminate before burning. Drying process is to safeguard the satisfactory strength of semimanufactures. Additionally, changes of ceramic samples capacity is to end the drying process, associated with elimination of humidity that would not compose defects -gaps, fractures, fragmentation etc. In this work it was shown, how the selected stages of drying regime influence the structural parameters of ceramics (reserve of porous volume, heterogeneity degree of structure, maximum rate of capillary rise according to watering front, capillary rate of mass flow, water absorption) and vice verse, how the selection of the dimensions of the stages for drying regime depends on the desired values of the of ceramics.

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Drying of gelcast ceramic parts via the liquid desiccant method

Cited by 61 publications

References 9 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

Synthesis and Performance of Nanostructure Templated Silica Membranes Surface-modified by Two Different Procedures

The Regulation of Structural Parameters of Ceramics Depending on the Drying Regime

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