A dryout mechanism model for rectangular narrow channels at high pressure conditions
A dryout mechanism model for rectangular narrow channels at high pressure conditions is developed by assuming that the Kelvin–Helmholtz instability triggered the occurrence of dryout. This model combines the advantages of theoretical analysis and empirical correlation. The unknown coefficients in th...
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| Format: | Article |
| Language: | English |
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Elsevier
2020-10-01
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| Series: | Nuclear Engineering and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1738573319310836 |
| _version_ | 1818324933538742272 |
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| author | Gongle Song Yu Liang Rulei Sun Dalin Zhang Jian Deng G.H. Su Wenxi Tian Suizheng Qiu |
| author_facet | Gongle Song Yu Liang Rulei Sun Dalin Zhang Jian Deng G.H. Su Wenxi Tian Suizheng Qiu |
| author_sort | Gongle Song |
| collection | DOAJ |
| description | A dryout mechanism model for rectangular narrow channels at high pressure conditions is developed by assuming that the Kelvin–Helmholtz instability triggered the occurrence of dryout. This model combines the advantages of theoretical analysis and empirical correlation. The unknown coefficients in the theoretical derivation are supported by the experimental data. Meanwhile, the decisive restriction of the experimental conditions on the applicability of the empirical correlation is avoided. The expression of vapor phase velocity at the time of dryout is derived, and the empirical correlation of liquid film thickness is introduced. Since the CHF value obtained from the liquid film thickness should be the same as the value obtained from the Kelvin–Helmholtz critical stability under the same condition, the convergent CHF value is obtained by iteratively calculating. Comparing with the experimental data under the pressure of 6.89–13.79 MPa, the average error of the model is −15.4% with the 95% confidence interval [-20.5%, −10.4%]. And the pressure has a decisive influence on the prediction accuracy of this model. Compared with the existing dryout code, the calculation speed of this model is faster, and the calculation accuracy is improved. This model, with great portability, could be applied to different objects and working conditions by changing the expression of the vapor phase velocity when the dryout phenomenon is triggered and the calculation formula of the liquid film. |
| first_indexed | 2024-12-13T11:36:27Z |
| format | Article |
| id | doaj.art-9dda020bea0c4c0392dc531855982a0b |
| institution | Directory Open Access Journal |
| issn | 1738-5733 |
| language | English |
| last_indexed | 2024-12-13T11:36:27Z |
| publishDate | 2020-10-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Nuclear Engineering and Technology |
| spelling | doaj.art-9dda020bea0c4c0392dc531855982a0b2022-12-21T23:47:46ZengElsevierNuclear Engineering and Technology1738-57332020-10-01521021962203A dryout mechanism model for rectangular narrow channels at high pressure conditionsGongle Song0Yu Liang1Rulei Sun2Dalin Zhang3Jian Deng4G.H. Su5Wenxi Tian6Suizheng Qiu7School of Nuclear Science and Technology, Shaanxi Key Laboratory of Advanced Nuclear Energy and Technology, State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, 710049, ChinaSchool of Nuclear Science and Technology, Shaanxi Key Laboratory of Advanced Nuclear Energy and Technology, State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, 710049, ChinaSchool of Nuclear Science and Technology, Shaanxi Key Laboratory of Advanced Nuclear Energy and Technology, State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, 710049, ChinaSchool of Nuclear Science and Technology, Shaanxi Key Laboratory of Advanced Nuclear Energy and Technology, State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, 710049, China; Corresponding author.Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu, 610041, China; Corresponding author.School of Nuclear Science and Technology, Shaanxi Key Laboratory of Advanced Nuclear Energy and Technology, State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, 710049, ChinaSchool of Nuclear Science and Technology, Shaanxi Key Laboratory of Advanced Nuclear Energy and Technology, State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, 710049, ChinaSchool of Nuclear Science and Technology, Shaanxi Key Laboratory of Advanced Nuclear Energy and Technology, State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, 710049, ChinaA dryout mechanism model for rectangular narrow channels at high pressure conditions is developed by assuming that the Kelvin–Helmholtz instability triggered the occurrence of dryout. This model combines the advantages of theoretical analysis and empirical correlation. The unknown coefficients in the theoretical derivation are supported by the experimental data. Meanwhile, the decisive restriction of the experimental conditions on the applicability of the empirical correlation is avoided. The expression of vapor phase velocity at the time of dryout is derived, and the empirical correlation of liquid film thickness is introduced. Since the CHF value obtained from the liquid film thickness should be the same as the value obtained from the Kelvin–Helmholtz critical stability under the same condition, the convergent CHF value is obtained by iteratively calculating. Comparing with the experimental data under the pressure of 6.89–13.79 MPa, the average error of the model is −15.4% with the 95% confidence interval [-20.5%, −10.4%]. And the pressure has a decisive influence on the prediction accuracy of this model. Compared with the existing dryout code, the calculation speed of this model is faster, and the calculation accuracy is improved. This model, with great portability, could be applied to different objects and working conditions by changing the expression of the vapor phase velocity when the dryout phenomenon is triggered and the calculation formula of the liquid film.http://www.sciencedirect.com/science/article/pii/S1738573319310836DryoutCHFKelvin-Helmholtz instabilityMechanism modelRectangular narrow channels |
| spellingShingle | Gongle Song Yu Liang Rulei Sun Dalin Zhang Jian Deng G.H. Su Wenxi Tian Suizheng Qiu A dryout mechanism model for rectangular narrow channels at high pressure conditions Nuclear Engineering and Technology Dryout CHF Kelvin-Helmholtz instability Mechanism model Rectangular narrow channels |
| title | A dryout mechanism model for rectangular narrow channels at high pressure conditions |
| title_full | A dryout mechanism model for rectangular narrow channels at high pressure conditions |
| title_fullStr | A dryout mechanism model for rectangular narrow channels at high pressure conditions |
| title_full_unstemmed | A dryout mechanism model for rectangular narrow channels at high pressure conditions |
| title_short | A dryout mechanism model for rectangular narrow channels at high pressure conditions |
| title_sort | dryout mechanism model for rectangular narrow channels at high pressure conditions |
| topic | Dryout CHF Kelvin-Helmholtz instability Mechanism model Rectangular narrow channels |
| url | http://www.sciencedirect.com/science/article/pii/S1738573319310836 |
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