TY  - JOUR
AU  - Vasić, Miloš
AU  - Grbavčić, Željko
AU  - Radojević, Zagorka
PY  - 2014
UR  - http://rims.institutims.rs/handle/123456789/252
AB  - The description of the drying process was reduced to the establishment of a series of theoretical and empirical drying models. The complex processes of simultaneous moisture and heat transfer, which are often nonstationary, and the distinct nature and properties of the material to be dried further complicate the description of the drying process. Three theories-diffusion theory, capillary flow theory, and evaporation-condensation theory-have won general recognition for the explanation of moisture transfer in porous media. The mechanisms of moisture movement during drying in the constant and especially in the falling drying period are rather complex and, hitherto, there have been no generally accepted explanations that could identify the exact transition between possible drying mechanisms, such as liquid movement due to capillary forces, liquid diffusion due to concentration gradients, liquid and vapor flow due to differences in total pressure, vapor diffusion due to difference in vapor concentration, vapor diffusion due to partial vapor pressure gradients, Knudsen diffusion, thermodiffusion, and the evaporation-condensation mechanism. The goal of this study was to find a way to better understand the different drying mechanisms, to identify the exact transition between them, and to estimate the time-dependent effective diffusivity. The results presented in this article confirmed that the effective diffusivity represents an overall mass transport property of moisture that includes all possible moisture transport mechanisms that are simultaneously controlling the moisture migration process in a material during drying. The experimental investigations were performed on clay tiles in a laboratory recirculation dryer, for which the drying parameters (humidity, temperature, and velocity) could be programmed, controlled, and monitored during drying.
PB  - Taylor & Francis Inc, Philadelphia
T2  - Drying Technology
T1  - Analysis of Moisture Transfer During the Drying of Clay Tiles with Particular Reference to an Estimation of the Time-Dependent Effective Diffusivity
EP  - 840
IS  - 7
SP  - 829
VL  - 32
DO  - 10.1080/07373937.2013.870194
ER  - 

@article{
author = "Vasić, Miloš and Grbavčić, Željko and Radojević, Zagorka",
year = "2014",
abstract = "The description of the drying process was reduced to the establishment of a series of theoretical and empirical drying models. The complex processes of simultaneous moisture and heat transfer, which are often nonstationary, and the distinct nature and properties of the material to be dried further complicate the description of the drying process. Three theories-diffusion theory, capillary flow theory, and evaporation-condensation theory-have won general recognition for the explanation of moisture transfer in porous media. The mechanisms of moisture movement during drying in the constant and especially in the falling drying period are rather complex and, hitherto, there have been no generally accepted explanations that could identify the exact transition between possible drying mechanisms, such as liquid movement due to capillary forces, liquid diffusion due to concentration gradients, liquid and vapor flow due to differences in total pressure, vapor diffusion due to difference in vapor concentration, vapor diffusion due to partial vapor pressure gradients, Knudsen diffusion, thermodiffusion, and the evaporation-condensation mechanism. The goal of this study was to find a way to better understand the different drying mechanisms, to identify the exact transition between them, and to estimate the time-dependent effective diffusivity. The results presented in this article confirmed that the effective diffusivity represents an overall mass transport property of moisture that includes all possible moisture transport mechanisms that are simultaneously controlling the moisture migration process in a material during drying. The experimental investigations were performed on clay tiles in a laboratory recirculation dryer, for which the drying parameters (humidity, temperature, and velocity) could be programmed, controlled, and monitored during drying.",
publisher = "Taylor & Francis Inc, Philadelphia",
journal = "Drying Technology",
title = "Analysis of Moisture Transfer During the Drying of Clay Tiles with Particular Reference to an Estimation of the Time-Dependent Effective Diffusivity",
pages = "840-829",
number = "7",
volume = "32",
doi = "10.1080/07373937.2013.870194"
}

Vasić, M., Grbavčić, Ž.,& Radojević, Z.. (2014). Analysis of Moisture Transfer During the Drying of Clay Tiles with Particular Reference to an Estimation of the Time-Dependent Effective Diffusivity. in Drying Technology
Taylor & Francis Inc, Philadelphia., 32(7), 829-840.
https://doi.org/10.1080/07373937.2013.870194

Vasić M, Grbavčić Ž, Radojević Z. Analysis of Moisture Transfer During the Drying of Clay Tiles with Particular Reference to an Estimation of the Time-Dependent Effective Diffusivity. in Drying Technology. 2014;32(7):829-840.
doi:10.1080/07373937.2013.870194 .

Vasić, Miloš, Grbavčić, Željko, Radojević, Zagorka, "Analysis of Moisture Transfer During the Drying of Clay Tiles with Particular Reference to an Estimation of the Time-Dependent Effective Diffusivity" in Drying Technology, 32, no. 7 (2014):829-840,
https://doi.org/10.1080/07373937.2013.870194 . .

TY  - JOUR
AU  - Vasić, Miloš
AU  - Grbavčić, Željko
AU  - Radojević, Zagorka
PY  - 2014
UR  - http://rims.institutims.rs/handle/123456789/239
AB  - Drying plays an important role in the production of clay tiles. In the present article, drying process is analyzed taking experimental data for several masonry clays obtained from different clay tile manufacturers and published data for different clay slabs. Calculation methods and computer programs designed for the calculation of the effective diffusion coefficient are developed. The first calculation method represents the analytical solution of the Crank equation, while the second one represents the analytical solution of the Efremov equation with boundary conditions in the form of the flux. Unlike other materials, clay tiles exhibit shrinkage during the drying process. For this reason, a shrinkage correction is included in both calculation methods. Four models (Al, A2, B1 and B2) for predicting the drying behavior are obtained as the result of the calculation cited programs. It is shown that the calculated effective diffusion coefficient determined by the designed computer programs, using experimentally obtained and selected published data sets have similar values to those of the same coefficient reported in the literature. Based on the mathematically determined prognostic values of the effective diffusion coefficient, it was concluded that there is more than 90% agreement between the experimentally recorded and the calculated drying curves.
PB  - Elsevier Science Sa, Lausanne
T2  - Chemical Engineering and Processing-Process Intensification
T1  - Determination of the moisture diffusivity coefficient and mathematical modeling of drying
EP  - 44
SP  - 33
VL  - 76
DO  - 10.1016/j.cep.2013.12.003
ER  - 

@article{
author = "Vasić, Miloš and Grbavčić, Željko and Radojević, Zagorka",
year = "2014",
abstract = "Drying plays an important role in the production of clay tiles. In the present article, drying process is analyzed taking experimental data for several masonry clays obtained from different clay tile manufacturers and published data for different clay slabs. Calculation methods and computer programs designed for the calculation of the effective diffusion coefficient are developed. The first calculation method represents the analytical solution of the Crank equation, while the second one represents the analytical solution of the Efremov equation with boundary conditions in the form of the flux. Unlike other materials, clay tiles exhibit shrinkage during the drying process. For this reason, a shrinkage correction is included in both calculation methods. Four models (Al, A2, B1 and B2) for predicting the drying behavior are obtained as the result of the calculation cited programs. It is shown that the calculated effective diffusion coefficient determined by the designed computer programs, using experimentally obtained and selected published data sets have similar values to those of the same coefficient reported in the literature. Based on the mathematically determined prognostic values of the effective diffusion coefficient, it was concluded that there is more than 90% agreement between the experimentally recorded and the calculated drying curves.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Chemical Engineering and Processing-Process Intensification",
title = "Determination of the moisture diffusivity coefficient and mathematical modeling of drying",
pages = "44-33",
volume = "76",
doi = "10.1016/j.cep.2013.12.003"
}

Vasić, M., Grbavčić, Ž.,& Radojević, Z.. (2014). Determination of the moisture diffusivity coefficient and mathematical modeling of drying. in Chemical Engineering and Processing-Process Intensification
Elsevier Science Sa, Lausanne., 76, 33-44.
https://doi.org/10.1016/j.cep.2013.12.003

Vasić M, Grbavčić Ž, Radojević Z. Determination of the moisture diffusivity coefficient and mathematical modeling of drying. in Chemical Engineering and Processing-Process Intensification. 2014;76:33-44.
doi:10.1016/j.cep.2013.12.003 .

Vasić, Miloš, Grbavčić, Željko, Radojević, Zagorka, "Determination of the moisture diffusivity coefficient and mathematical modeling of drying" in Chemical Engineering and Processing-Process Intensification, 76 (2014):33-44,
https://doi.org/10.1016/j.cep.2013.12.003 . .

TY  - JOUR
AU  - Vasić, Miloš
AU  - Radojević, Zagorka
AU  - Grbavčić, Željko
PY  - 2012
UR  - http://rims.institutims.rs/handle/123456789/181
AB  - Cilj ovog rada je da se na primeru dve opekarske gline sa različitih lokaliteta odredi efektivni koeficijenat difuzije na osnovu eksperimentalno snimljenih krivih sušenja. Razvijen je metod i napravljena su dva kompjuterska programa za određivanje ovog koeficijenta, koji se zasnivaju na matematičkom rešavanju Fikove, odnosno Krankove difuzione jednačine. Po prvi put uzeto je u razmatranje i skupljanje opekarskih proizvoda u toku sušenja a odgovarajuća korekcija je uneta u proračun. Rezultati pokazuju da su vrednosti efektivnog koeficijenta difuzije određeni kompjuterskim programima (sa korekcijom i bez korekcije na skupljanje opekarskih proizvoda) reda veličine koje su navedene u literaturi za druge vrste opekarskih glina. Na osnovu matematičkim putem prognoziranih vrednosti efektivnog koeficijenta difuzije konstatovano je, da bez obzira na polazni mineraloški sastav opekarske sirovine, postoji 90 % slaganja prognoziranih krivih sušenja sa eksperimentalno snimljenim krivima sušenja. Za slučaj kada je uvedena u proračune i korekcija na skupljanje opekarskih proizvoda ovo slaganje je još veće.
AB  - The aim of this study was to calculate the effective diffusion coefficient based on experimentally recorded drying curves for two masonry clays obtained from different localities. The calculation method and two computer programs based on the mathematical calculation of the Second Fick Law and the Cranck Diffusion Equation were developed. Masonry product shrinkage during drying was taken into consideration for the first time and the appropriate correction was entered into the calculation. The results presented in this paper show that the values of the effective diffusion coefficient determined by the designed computer programs (with and without the correction for shrinkage) have similar values to those available in the literature for the same coefficient for different clays. Based on the mathematically determined prognostic value of the effective diffusion coefficient, it was concluded that, whatever the initial mineralogical composition of the clay, there is 90 % agreement of the calculated prognostic drying curves with the experimentally recorded ones. When a shrinkage correction of the masonry products is introduced into the calculation step, this agreement is even better.
PB  - Srpsko hemijsko društvo, Beograd
T2  - Journal of the Serbian Chemical Society
T1  - Određivanje efektivnog koeficijenta difuzije prilikom sušenja uzoraka od gline
T1  - Calculation of the effective diffusion coefficient during the drying of clay samples
EP  - 533
IS  - 4
SP  - 523
VL  - 77
DO  - 10.2298/JSC110717191V
ER  - 

@article{
author = "Vasić, Miloš and Radojević, Zagorka and Grbavčić, Željko",
year = "2012",
abstract = "Cilj ovog rada je da se na primeru dve opekarske gline sa različitih lokaliteta odredi efektivni koeficijenat difuzije na osnovu eksperimentalno snimljenih krivih sušenja. Razvijen je metod i napravljena su dva kompjuterska programa za određivanje ovog koeficijenta, koji se zasnivaju na matematičkom rešavanju Fikove, odnosno Krankove difuzione jednačine. Po prvi put uzeto je u razmatranje i skupljanje opekarskih proizvoda u toku sušenja a odgovarajuća korekcija je uneta u proračun. Rezultati pokazuju da su vrednosti efektivnog koeficijenta difuzije određeni kompjuterskim programima (sa korekcijom i bez korekcije na skupljanje opekarskih proizvoda) reda veličine koje su navedene u literaturi za druge vrste opekarskih glina. Na osnovu matematičkim putem prognoziranih vrednosti efektivnog koeficijenta difuzije konstatovano je, da bez obzira na polazni mineraloški sastav opekarske sirovine, postoji 90 % slaganja prognoziranih krivih sušenja sa eksperimentalno snimljenim krivima sušenja. Za slučaj kada je uvedena u proračune i korekcija na skupljanje opekarskih proizvoda ovo slaganje je još veće., The aim of this study was to calculate the effective diffusion coefficient based on experimentally recorded drying curves for two masonry clays obtained from different localities. The calculation method and two computer programs based on the mathematical calculation of the Second Fick Law and the Cranck Diffusion Equation were developed. Masonry product shrinkage during drying was taken into consideration for the first time and the appropriate correction was entered into the calculation. The results presented in this paper show that the values of the effective diffusion coefficient determined by the designed computer programs (with and without the correction for shrinkage) have similar values to those available in the literature for the same coefficient for different clays. Based on the mathematically determined prognostic value of the effective diffusion coefficient, it was concluded that, whatever the initial mineralogical composition of the clay, there is 90 % agreement of the calculated prognostic drying curves with the experimentally recorded ones. When a shrinkage correction of the masonry products is introduced into the calculation step, this agreement is even better.",
publisher = "Srpsko hemijsko društvo, Beograd",
journal = "Journal of the Serbian Chemical Society",
title = "Određivanje efektivnog koeficijenta difuzije prilikom sušenja uzoraka od gline, Calculation of the effective diffusion coefficient during the drying of clay samples",
pages = "533-523",
number = "4",
volume = "77",
doi = "10.2298/JSC110717191V"
}

Vasić, M., Radojević, Z.,& Grbavčić, Ž.. (2012). Određivanje efektivnog koeficijenta difuzije prilikom sušenja uzoraka od gline. in Journal of the Serbian Chemical Society
Srpsko hemijsko društvo, Beograd., 77(4), 523-533.
https://doi.org/10.2298/JSC110717191V

Vasić M, Radojević Z, Grbavčić Ž. Određivanje efektivnog koeficijenta difuzije prilikom sušenja uzoraka od gline. in Journal of the Serbian Chemical Society. 2012;77(4):523-533.
doi:10.2298/JSC110717191V .

Vasić, Miloš, Radojević, Zagorka, Grbavčić, Željko, "Određivanje efektivnog koeficijenta difuzije prilikom sušenja uzoraka od gline" in Journal of the Serbian Chemical Society, 77, no. 4 (2012):523-533,
https://doi.org/10.2298/JSC110717191V . .

TY  - JOUR
AU  - Vasić, Miloš
AU  - Radojević, Zagorka
AU  - Arsenović, Milica
AU  - Grbavčić, Željko
PY  - 2011
UR  - http://rims.institutims.rs/handle/123456789/152
AB  - The equation for drying kinetics is obtained, base on the analytical solution of the differential equation with a boundary condition in the form of the flux. This equation was initially developed by G. Efremov. In this paper a modification of the Efremov drying equation will be presented. Shrinkage correction will be included in that equation for the first time. Two programs were designed to compute the effective diffusion coefficient. First program did not include shrinkage effect during drying into the computation algorithm while the second one has included it. Two models for predicting the drying behavior were obtained as the result of cited programs calculation. First model did not include shrinkage (model 1) and second one (model 2) has included it. The predicted values obtained from model 2 fit with experimental data. Results presented in this study showed that the values of effective diffusion coefficient determined by designed computer programs have similar values with values available in literature related to the same coefficient determined for different clays.
T2  - Revista Romana de Materiale/ Romanian Journal of Materials
T1  - Determination of the effective diffusion coefficient
EP  - 175
IS  - 2
SP  - 169
VL  - 41
UR  - https://hdl.handle.net/21.15107/rcub_rims_152
ER  - 

@article{
author = "Vasić, Miloš and Radojević, Zagorka and Arsenović, Milica and Grbavčić, Željko",
year = "2011",
abstract = "The equation for drying kinetics is obtained, base on the analytical solution of the differential equation with a boundary condition in the form of the flux. This equation was initially developed by G. Efremov. In this paper a modification of the Efremov drying equation will be presented. Shrinkage correction will be included in that equation for the first time. Two programs were designed to compute the effective diffusion coefficient. First program did not include shrinkage effect during drying into the computation algorithm while the second one has included it. Two models for predicting the drying behavior were obtained as the result of cited programs calculation. First model did not include shrinkage (model 1) and second one (model 2) has included it. The predicted values obtained from model 2 fit with experimental data. Results presented in this study showed that the values of effective diffusion coefficient determined by designed computer programs have similar values with values available in literature related to the same coefficient determined for different clays.",
journal = "Revista Romana de Materiale/ Romanian Journal of Materials",
title = "Determination of the effective diffusion coefficient",
pages = "175-169",
number = "2",
volume = "41",
url = "https://hdl.handle.net/21.15107/rcub_rims_152"
}

Vasić, M., Radojević, Z., Arsenović, M.,& Grbavčić, Ž.. (2011). Determination of the effective diffusion coefficient. in Revista Romana de Materiale/ Romanian Journal of Materials, 41(2), 169-175.
https://hdl.handle.net/21.15107/rcub_rims_152

Vasić M, Radojević Z, Arsenović M, Grbavčić Ž. Determination of the effective diffusion coefficient. in Revista Romana de Materiale/ Romanian Journal of Materials. 2011;41(2):169-175.
https://hdl.handle.net/21.15107/rcub_rims_152 .

Vasić, Miloš, Radojević, Zagorka, Arsenović, Milica, Grbavčić, Željko, "Determination of the effective diffusion coefficient" in Revista Romana de Materiale/ Romanian Journal of Materials, 41, no. 2 (2011):169-175,
https://hdl.handle.net/21.15107/rcub_rims_152 .