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Zhao M, Liu X, Badea A, Feuerstein F, Cheng X. Comparison of heat transfer models with databank of supercritical fluid. KERNTECHNIK 2018. [DOI: 10.3139/124.110880] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Abstract
Because of the large variation of thermal–physical properties near pseudo-critical point, heat transfer of supercritical water shows abnormal behavior. Thus, an accurate prediction of heat transfer between the cladding and fluid plays a very important role. It is necessary to investigate the reliably of heat transfer models in the vicinity of the pseudo-critical point. In the frame of evaluating the present HT models and developing new reliable prediction models, databank of heat transfer of supercritical water flowing in tube were established by Karlsruhe Institute of Technology (KIT) with more than 35,000 experimental data. A thorough analysis and assessment was carried out, to give an insight into the characters of the database. Experimental data from different sources are compared to figure out the deviation between different sources and to present the reliability of the database.
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Affiliation(s)
- M. Zhao
- Institute of Fusion and Reactor Technology , Karlsruhe Institute of Technologies, Kaiserstr. 12, Geb. 07.08, 76131, Karlsruhe , Germany
| | - X. Liu
- School of Nuclear Science and Engineering , Shanghai Jiao Tong University, Dongchuan Rd. 800, 200240, Shanghai , P.R. China
| | - A. Badea
- Institute of Fusion and Reactor Technology , Karlsruhe Institute of Technologies, Kaiserstr. 12, Geb. 07.08, 76131, Karlsruhe , Germany
| | - F. Feuerstein
- Institute of Fusion and Reactor Technology , Karlsruhe Institute of Technologies, Kaiserstr. 12, Geb. 07.08, 76131, Karlsruhe , Germany
| | - X. Cheng
- Institute of Fusion and Reactor Technology , Karlsruhe Institute of Technologies, Kaiserstr. 12, Geb. 07.08, 76131, Karlsruhe , Germany
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Abstract
Abstract
Post dryout heat transfer and rewetting are important processes determining the level and the time duration of high temperature phase and the integrity of the fuel cladding. In spite of extensive studies in the past decades, reliable prediction methods are still missing due to the complexity of processes involved, which consist mainly of interaction between solid wall, main gas flow and droplets. In the present study, a phenomenological model is proposed considering the three individual heat transfer processes between the three parts. Main new features of the present model compared to the models available in the open literature are the mechanistic modeling of (a) droplet concentration and droplet size, (b) turbulent fluctuation velocity of droplets and its critical value, (c) evaporation rate of droplets arriving the wall. Comparison of the new model with selected experimental data shows at least qualitatively good agreement. The experimental behavior of wall temperature can be well explained. According to the new model the Leidenfrost effect results in the hysteresis behavior of wall temperature.
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Affiliation(s)
- X. Cheng
- Karlsruhe Institute of Technology (KIT) , Institut für Fusionstechnologie und Reaktortechnik (IFRT), Vincenz – Prießnitz Str. 3, 76133 Karlsruhe , Germany
| | - F. Feuerstein
- Karlsruhe Institute of Technology (KIT) , Institut für Fusionstechnologie und Reaktortechnik (IFRT), Vincenz – Prießnitz Str. 3, 76133 Karlsruhe , Germany
| | - D. Klingel
- Karlsruhe Institute of Technology (KIT) , Institut für Fusionstechnologie und Reaktortechnik (IFRT), Vincenz – Prießnitz Str. 3, 76133 Karlsruhe , Germany
| | - D. L. Yu
- Karlsruhe Institute of Technology (KIT) , Institut für Fusionstechnologie und Reaktortechnik (IFRT), Vincenz – Prießnitz Str. 3, 76133 Karlsruhe , Germany
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