Numerical and experimental investigation of pressure drop characteristics during upward boiling two-phase flow of nitrogen |
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| Affiliation: | 1. State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, PR China;2. Kunming Institute of Physics, Kunming 650223, PR China;1. China Ship Development and Design Center, Hubei 430064, PR China;2. Key Discipline Laboratory of Nuclear Safety and Simulation Technology, Harbin Engineering University, Heilongjiang 150001, PR China;1. POLO Research Laboratories for Emerging Technologies in Cooling and Thermophysics, Department of Mechanical Engineering, Federal University of Santa Catarina (UFSC), Florianópolis, SC 88040900, Brazil;2. Whirlpool Latin America, Technology Center, Joinville, SC 89219900, Brazil;1. Department of Nuclear, Plasma, and Radiological Engineering, University of Illinois, Urbana, IL 61801, USA;2. School of Nuclear Engineering, Purdue University, West Lafayette, IN 47907-1290, USA;1. Fundamental Science on Nuclear Safety and Simulation Technology Laboratory, Harbin Engineering University, Harbin 150001, China;2. Wuhan Second Ship Design and Research Institute, Wuhan, Hubei 430205, China |
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| Abstract: | The characteristics of overall pressure drop during upward boiling two-phase flow of nitrogen with constant mass flux and varying heat flux are experimentally investigated using a vertical tube with an inner diameter of 6.0 mm and numerically simulated using the two-fluid model with new closure correlations. Comparison of the numerical results against the experimental data shows that prior to the transition point in the curve of pressure drop evolution, the predicted pressure drop is in a satisfactory agreement with the experimental data. The present study demonstrates that both the wall lubrication force modeling and the bubble diameter modeling have significant effect on the pressure drop prediction. Both the theoretical analysis and the experimental evidence suggest that the transition point in the pressure drop evolution curve reflects the bubbly-to-slug flow regime transition. |
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