The application of the thin and lumped appreoach for comparision of the drying kinetic registered for various thin clay slabs
2024
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The main goal of this paper was to compare the lumped and thin layer modelling approach for
describing the drying kinetics of clay slabs extruded from various clays. Four drying regimes
were firstly designed. The drying velocity was fixed to 3 m/s in all experiments. The drying
temperature and humidity were hold at 400C and 60% in the first drying regime. These
parameters were raised for 100C and 10% in each following experiment. Eight thin-layer models,
including the new one, was used. The non-linear regression analysis was applied for fitting the
experimental data. The lumped approach is relatively new and it assumes that different drying
mechanisms which affects the internal moisture transport are combined and presented in a form
of the effective diffusivity constant. The lumped modelling approach has retained and reused the
form of the Crack’s diffusion equation with only one update. The pure diffusion coefficient was
replaced with the effective one. Since the effective m...oisture diffusivity can vary with time the
most advanced lumped models are taking this into account by defining the relationship between
the effective diffusivity coefficient and the Fourier number. This model was adopted in this paper. Results have shown that the best thin layer model was the new one. It was found that this
model has up to 5 % deviation from the experimentally registered data at the beginning of the
first drying segment. The lumped model was deviating from the experimental data for only 2%.
This was another confirmation that the conjugation degree in thin layer modelling is lower than in
the case of the lumped approach. This means that thin layer model application is actually very
limited, especially for porous materials which predominantly shrinks during drying, due to
theoretical assumptions which simplifies the boundary conditions for which the equations were
originally developed.
Кључне речи:
clay slabs / non-linear regression analysis / Crack’s diffusion equationИзвор:
Serbian Ceramic Society Conference ”Advanced Ceramics and Application XII”, Program and the Book of Abstracts; September 18-20, 2024; Belgrade, Serbia, 2024, 76-77Издавач:
- Serbian Ceramic Society
Финансирање / пројекти:
- Министарство науке, технолошког развоја и иновација Републике Србије, институционално финансирање - 200105 (Универзитет у Београду, Машински факултет) (RS-MESTD-inst-2020-200105)
- Министарство науке, технолошког развоја и иновација Републике Србије, институционално финансирање - 200026 (Универзитет у Београду, Институт за хемију, технологију и металургију - ИХТМ) (RS-MESTD-inst-2020-200026)
- Министарство науке, технолошког развоја и иновација Републике Србије, институционално финансирање - 200012 (Институт за испитивање материјала Србије - ИМС, Београд) (RS-MESTD-inst-2020-200012)
- Министарство науке, технолошког развоја и иновација Републике Србије, институционално финансирање - 200105 (Универзитет у Београду, Машински факултет) (RS-MESTD-inst-2020-200105)
Институција/група
IHTMTY - CONF AU - Vasić, Miloš AU - Vorkapić, Miloš AU - Vencl, Aleksandar PY - 2024 UR - https://cer.ihtm.bg.ac.rs/handle/123456789/7861 AB - The main goal of this paper was to compare the lumped and thin layer modelling approach for describing the drying kinetics of clay slabs extruded from various clays. Four drying regimes were firstly designed. The drying velocity was fixed to 3 m/s in all experiments. The drying temperature and humidity were hold at 400C and 60% in the first drying regime. These parameters were raised for 100C and 10% in each following experiment. Eight thin-layer models, including the new one, was used. The non-linear regression analysis was applied for fitting the experimental data. The lumped approach is relatively new and it assumes that different drying mechanisms which affects the internal moisture transport are combined and presented in a form of the effective diffusivity constant. The lumped modelling approach has retained and reused the form of the Crack’s diffusion equation with only one update. The pure diffusion coefficient was replaced with the effective one. Since the effective moisture diffusivity can vary with time the most advanced lumped models are taking this into account by defining the relationship between the effective diffusivity coefficient and the Fourier number. This model was adopted in this paper. Results have shown that the best thin layer model was the new one. It was found that this model has up to 5 % deviation from the experimentally registered data at the beginning of the first drying segment. The lumped model was deviating from the experimental data for only 2%. This was another confirmation that the conjugation degree in thin layer modelling is lower than in the case of the lumped approach. This means that thin layer model application is actually very limited, especially for porous materials which predominantly shrinks during drying, due to theoretical assumptions which simplifies the boundary conditions for which the equations were originally developed. PB - Serbian Ceramic Society C3 - Serbian Ceramic Society Conference ”Advanced Ceramics and Application XII”, Program and the Book of Abstracts; September 18-20, 2024; Belgrade, Serbia T1 - The application of the thin and lumped appreoach for comparision of the drying kinetic registered for various thin clay slabs SP - 76 EP - 77 UR - https://hdl.handle.net/21.15107/rcub_cer_7861 ER -
@conference{ author = "Vasić, Miloš and Vorkapić, Miloš and Vencl, Aleksandar", year = "2024", abstract = "The main goal of this paper was to compare the lumped and thin layer modelling approach for describing the drying kinetics of clay slabs extruded from various clays. Four drying regimes were firstly designed. The drying velocity was fixed to 3 m/s in all experiments. The drying temperature and humidity were hold at 400C and 60% in the first drying regime. These parameters were raised for 100C and 10% in each following experiment. Eight thin-layer models, including the new one, was used. The non-linear regression analysis was applied for fitting the experimental data. The lumped approach is relatively new and it assumes that different drying mechanisms which affects the internal moisture transport are combined and presented in a form of the effective diffusivity constant. The lumped modelling approach has retained and reused the form of the Crack’s diffusion equation with only one update. The pure diffusion coefficient was replaced with the effective one. Since the effective moisture diffusivity can vary with time the most advanced lumped models are taking this into account by defining the relationship between the effective diffusivity coefficient and the Fourier number. This model was adopted in this paper. Results have shown that the best thin layer model was the new one. It was found that this model has up to 5 % deviation from the experimentally registered data at the beginning of the first drying segment. The lumped model was deviating from the experimental data for only 2%. This was another confirmation that the conjugation degree in thin layer modelling is lower than in the case of the lumped approach. This means that thin layer model application is actually very limited, especially for porous materials which predominantly shrinks during drying, due to theoretical assumptions which simplifies the boundary conditions for which the equations were originally developed.", publisher = "Serbian Ceramic Society", journal = "Serbian Ceramic Society Conference ”Advanced Ceramics and Application XII”, Program and the Book of Abstracts; September 18-20, 2024; Belgrade, Serbia", title = "The application of the thin and lumped appreoach for comparision of the drying kinetic registered for various thin clay slabs", pages = "76-77", url = "https://hdl.handle.net/21.15107/rcub_cer_7861" }
Vasić, M., Vorkapić, M.,& Vencl, A.. (2024). The application of the thin and lumped appreoach for comparision of the drying kinetic registered for various thin clay slabs. in Serbian Ceramic Society Conference ”Advanced Ceramics and Application XII”, Program and the Book of Abstracts; September 18-20, 2024; Belgrade, Serbia Serbian Ceramic Society., 76-77. https://hdl.handle.net/21.15107/rcub_cer_7861
Vasić M, Vorkapić M, Vencl A. The application of the thin and lumped appreoach for comparision of the drying kinetic registered for various thin clay slabs. in Serbian Ceramic Society Conference ”Advanced Ceramics and Application XII”, Program and the Book of Abstracts; September 18-20, 2024; Belgrade, Serbia. 2024;:76-77. https://hdl.handle.net/21.15107/rcub_cer_7861 .
Vasić, Miloš, Vorkapić, Miloš, Vencl, Aleksandar, "The application of the thin and lumped appreoach for comparision of the drying kinetic registered for various thin clay slabs" in Serbian Ceramic Society Conference ”Advanced Ceramics and Application XII”, Program and the Book of Abstracts; September 18-20, 2024; Belgrade, Serbia (2024):76-77, https://hdl.handle.net/21.15107/rcub_cer_7861 .