Surface energy equation for heat transfer process in a pebble fuel
| Autor: | Gilberto Espinosa-Paredes, L.E. Herranz-Puebla, V. Castillo-Jiménez, R. Vázquez-Rodríguez |
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| Rok vydání: | 2014 |
| Předmět: |
Cladding (metalworking)
Nuclear and High Energy Physics Work (thermodynamics) Materials science Mechanical Engineering Thermodynamics engineering.material Surface energy Matrix (geology) Nuclear Energy and Engineering Coating Mass transfer engineering General Materials Science Graphite Safety Risk Reliability and Quality Transport phenomena Waste Management and Disposal |
| Zdroj: | Nuclear Engineering and Design. 280:269-284 |
| ISSN: | 0029-5493 |
| Popis: | In this paper the surface energy equation for the heat transfer process (HT) between the mixture of fuel (TRISO particles and graphite matrix) and coating in a fuel pebble is derived. The fuel pebble can be treated as a heterogeneous region (mixture of microspheres and graphite) interacting thermally with the homogeneous region (the coating or cladding). These two regions are separated by a boundary region where the properties and behavior differ from those of the adjoining regions. The methodology applied for deriving the surface energy equation is based on the classical theory on interfacial transport phenomena. The surface energy equation derived in this work is an average equation that represents an upscaling respect to the local description. The regions around the surface where changes in the physical phenomena are important are of the order of microns, in contrast with interfacial mass transfer between phases that may be several molecular diameters. The numerical analysis regarding the application of surface energy equation is presented in this work. |
| Databáze: | OpenAIRE |
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