Dynamical and thermal performance of molten salt pipe during filling process |
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| Authors: | Jianfeng Lu Jing Ding |
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| Affiliation: | 1. Karlsruhe Institute of Technology KIT, Hermann-von-Helmholtz-Platz 1, 46344 Eggenstein-Leopoldshafen, Germany;2. German Aerospace Center DLR, Pfaffenwaldring 38-40, 70569 Stuttgart, Germany;3. Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milano, Italy;1. School of Engineering, Sun Yat-sen University, Guangzhou 510006, PR China;2. Key Laboratory of Enhanced Heat Transfer and Energy Conservation of the Ministry of Education, South China University of Technology, Guangzhou 510640, PR China;3. Key Laboratory of Enhanced Heat Transfer and Energy Conservation of the Ministry of Education, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, PR China;1. Surface Engineering and Nanostructured Materials Research Group, Complutense University of Madrid, Av. Complutense s/n, Madrid, Spain;2. Energy Development Center, University of Antofagasta, Avenue Universidad de Antofagasta 02800, Antofagasta, Chile;3. Solar Energy Research Center (SERC-Chile), Av Tupper 2007, Piso 4, Santiago, Chile;1. School of Engineering, Sun Yat-sen University, Guangzhou High Education Mega Center, 132 Waihuan Dong Road, Guangzhou 510006, PR China;2. Key Laboratory of Enhanced Heat Transfer and Energy Conservation of the Ministry of Education, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, PR China |
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| Abstract: | The dynamical and thermal performances of molten salt pipe during the filling process are numerically investigated using volume of fluid model. The whole filling process has three main stages, or the developing stage with the interface width quickly increasing, the fluctuating stage with the interface width fluctuating and the fully developed stage with stable interface, and then associated interface structures, flow and temperature fields are described in detail. Before the molten salt flows through a certain position, the fluid temperature will jump within a short time, while the wall temperature only linearly increases after that. The heat transport during the filling process is mainly dependent upon the pipe wall and molten salt flow, while natural convection outside can almost be ignored. The dimensionless interface temperature has similar evolution process under different surrounding temperatures, but it will apparently increase with the flow velocity rising. In addition, the pipe will be blocked when the interface temperature drops below the freezing point, so a model of penetration distance is derived by correlating the interface temperature evolution process, and it has a good agreement with available experimental results. |
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