Analysis of Moisture Transfer During the Drying of Clay Tiles with Particular Reference to an Estimation of the Time-Dependent Effective Diffusivity
Апстракт
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.
Кључне речи:
Shrinkage / Effective diffusivity / Drying / Drying mechanisms / Clay tileИзвор:
Drying Technology, 2014, 32, 7, 829-840Издавач:
- Taylor & Francis Inc, Philadelphia
Финансирање / пројекти:
- Развој и примена мултифункционалних материјала на бази домаћих сировина модернизацијом традиционалних технологија (RS-MESTD-Integrated and Interdisciplinary Research (IIR or III)-45008)
DOI: 10.1080/07373937.2013.870194
ISSN: 0737-3937
WoS: 000335119500009
Scopus: 2-s2.0-84899744042
Институција/група
Institut za ispitivanje materijalaTY - 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 . .