High porous yttria-stabilized zirconia with aligned pore channels: Morphology directionality influence on heat transfer |
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| Affiliation: | 1. Chemical Engineering Department, Faculty of Engineering, Minia University, 61517 El-Minia, Egypt;2. Chemical Engineering Department, Faculty of Engineering, Beni-Suef University, Beni-Suef, Egypt;3. Bionanosystem Engineering Department, Chonbuk National University, Jeonju 561-756, Republic of Korea;4. Central Laboratory Unit, Qatar University, P. O. Box: 2713, Doha, Qatar;5. Chemical Engineering Program, Texas A&M University at Qatar, P.O. 23874, Doha, Qatar;1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;2. Wuhan Iron and Steel Group Refractory Materials Limited Liability Company, Wuhan 430081, China;1. Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Sciences and Technology, China University of Geosciences, Beijing 100083, China;2. Laboratory of Crystal Physics, Institute of Physics, SB RAS, Krasnoyarsk 660036, Russia;3. Department of Physics, Far Eastern State Transport University, Khabarovsk 680021, Russia;1. Department of Chemistry, College of Science, King Saud University, Riyadh 11451, Saudi Arabia;2. Promising Centre for Sensors and Electronic Devices (PCSED), Najran University, P.O. Box-1988, Najran 11001, Saudi Arabia;3. Department of Chemistry, College of Science and Arts, Najran University, P.O. Box-1988, Najran 11001, Saudi Arabia;4. PG Department of Chemistry, JCDAV College (Panjab University), Dasuya 144205, Punjab, India;5. Research Centre, College of Science, King Saud University, Riyadh 11451, Saudi Arabia;1. University of Nis, Faculty of Electronic Engineering, Aleksandra Medvedeva 14, 18000 Ni?, Serbia;2. Institute of Technical Sciences, SASA, Knez Mihailova 35, 11000 Belgrade, Serbia |
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| Abstract: | High porous yttria stabilized zirconia with unidirectionally aligned channels is used in engineering applications with extremely low thermal conductivity. This property is strongly influenced by microstructure features such as pore volume fraction, pore size distribution, random porous microstructure and pore morphology directionality. Although several models are reported in the available literature, but their analytical formulas are formalised for homogeneous structures or they are based on proportion between solid and fluid phases. These differences from real microstructures cause significant computational errors especially when thermal conductivity changes as the function of the measurement direction (parallel or perpendicular). In this context, the application of an intermingled fractal unit's procedure capable of reproducing porous microstructure as well as predicting thermal conductivity has been proposed. The results are in agreement with experimental ones measured for parallel and perpendicular directions and suggest improving the formalisation of fractal modelling in order to obtain an instrument of microstructure design. |
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| Keywords: | Yttria-stabilized zirconia Pore size distribution Porous materials Thermal conductivity Modelling |
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