Numerical Simulation of Thermal Conductivity and Thermal Stress in Lightweight Refractory Concrete with Cenospheres
The main objective of this paper was to investigate the heat transfer of modified lightweight refractory concrete at the microscopic scale. In this work, such material was treated as a porous composite based on the compound of calcium aluminate cement and aluminosilicate cenospheres. The presence of...
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2022-12-01
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| author | Darius Mačiūnas Szymon Nosewicz Rimantas Kačianauskas Renata Boris Rimvydas Stonys |
| author_facet | Darius Mačiūnas Szymon Nosewicz Rimantas Kačianauskas Renata Boris Rimvydas Stonys |
| author_sort | Darius Mačiūnas |
| collection | DOAJ |
| description | The main objective of this paper was to investigate the heat transfer of modified lightweight refractory concrete at the microscopic scale. In this work, such material was treated as a porous composite based on the compound of calcium aluminate cement and aluminosilicate cenospheres. The presence of air inclusions within the cenospheres was an essential factor in the reduction in thermal performance. Due to the intricacy of the subject investigated, our research employed numerical, theoretical, and experimental approaches. Scanning electron microscopy (SEM) imaging was performed to study the composite microstructure with a special focus on geometry, dimensions, and the distribution of cenospheres. Based on the experimental analysis, simplified geometrical models were generated to reproduce the main features of the composite matrix and cenospheres. A finite element framework was used to determine the effective thermal conductivity of such domains as well as the thermal stresses generated in the sample during the heat flow. A considerable difference in thermal properties was revealed by comparing the simulation results of the pure composite matrix and the samples, indicating a varying arrangement of cenosphere particles. The numerical results were complemented by a theoretical study that applied analytical models derived from the two-phase mixture theory—parallel and Landauer. A satisfactory agreement between numerical and theoretical results was achieved; however, the extension of both presented approaches is required. |
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| format | Article |
| id | doaj.art-9793b356d19c409aa7368f0ee54746e4 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-11T09:56:08Z |
| publishDate | 2022-12-01 |
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| spelling | doaj.art-9793b356d19c409aa7368f0ee54746e42023-11-16T15:48:15ZengMDPI AGMaterials1996-19442022-12-0116119010.3390/ma16010190Numerical Simulation of Thermal Conductivity and Thermal Stress in Lightweight Refractory Concrete with CenospheresDarius Mačiūnas0Szymon Nosewicz1Rimantas Kačianauskas2Renata Boris3Rimvydas Stonys4Department of Applied Mechanics, Vilnius Gediminas Technical University, 10223 Vilnius, LithuaniaInstitute of Fundamental Technological Research Polish Academy of Sciences, 02-106 Warsaw, PolandDepartment of Applied Mechanics, Vilnius Gediminas Technical University, 10223 Vilnius, LithuaniaInstitute of Building Materials, Vilnius Gediminas Technical University, 10223 Vilnius, LithuaniaInstitute of Building Materials, Vilnius Gediminas Technical University, 10223 Vilnius, LithuaniaThe main objective of this paper was to investigate the heat transfer of modified lightweight refractory concrete at the microscopic scale. In this work, such material was treated as a porous composite based on the compound of calcium aluminate cement and aluminosilicate cenospheres. The presence of air inclusions within the cenospheres was an essential factor in the reduction in thermal performance. Due to the intricacy of the subject investigated, our research employed numerical, theoretical, and experimental approaches. Scanning electron microscopy (SEM) imaging was performed to study the composite microstructure with a special focus on geometry, dimensions, and the distribution of cenospheres. Based on the experimental analysis, simplified geometrical models were generated to reproduce the main features of the composite matrix and cenospheres. A finite element framework was used to determine the effective thermal conductivity of such domains as well as the thermal stresses generated in the sample during the heat flow. A considerable difference in thermal properties was revealed by comparing the simulation results of the pure composite matrix and the samples, indicating a varying arrangement of cenosphere particles. The numerical results were complemented by a theoretical study that applied analytical models derived from the two-phase mixture theory—parallel and Landauer. A satisfactory agreement between numerical and theoretical results was achieved; however, the extension of both presented approaches is required.https://www.mdpi.com/1996-1944/16/1/190thermal conductivityheat transferfinite element methodthermal stressmicrostructurecalcium aluminate cement |
| spellingShingle | Darius Mačiūnas Szymon Nosewicz Rimantas Kačianauskas Renata Boris Rimvydas Stonys Numerical Simulation of Thermal Conductivity and Thermal Stress in Lightweight Refractory Concrete with Cenospheres Materials thermal conductivity heat transfer finite element method thermal stress microstructure calcium aluminate cement |
| title | Numerical Simulation of Thermal Conductivity and Thermal Stress in Lightweight Refractory Concrete with Cenospheres |
| title_full | Numerical Simulation of Thermal Conductivity and Thermal Stress in Lightweight Refractory Concrete with Cenospheres |
| title_fullStr | Numerical Simulation of Thermal Conductivity and Thermal Stress in Lightweight Refractory Concrete with Cenospheres |
| title_full_unstemmed | Numerical Simulation of Thermal Conductivity and Thermal Stress in Lightweight Refractory Concrete with Cenospheres |
| title_short | Numerical Simulation of Thermal Conductivity and Thermal Stress in Lightweight Refractory Concrete with Cenospheres |
| title_sort | numerical simulation of thermal conductivity and thermal stress in lightweight refractory concrete with cenospheres |
| topic | thermal conductivity heat transfer finite element method thermal stress microstructure calcium aluminate cement |
| url | https://www.mdpi.com/1996-1944/16/1/190 |
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