One-dimensional drift-flux model for two-phase flow in pool rod bundle systems

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• 作者：Shao-Wen Chen^a ; Yang Liu^a ; Takashi Hibiki^a ; Mamoru Ishii^a ; ^{ishii@purdue.edu} ; Yoshitaka Yoshida^b ; Ikuo Kinoshita^b ; Michio Murase^b ; Kaichiro Mishima^b
• 关键词：Rod bundles ; Two-phase flow ; Pool conditions ; Void fraction ; Drift-flux model
• 刊名：International Journal of Multiphase Flow
• 出版年：2012
• 出版时间：April, 2012
• 年：2012
• 卷：40
• 期：Complete
• 页码：166-177
• 全文大小：1649 K

文摘

A one-dimensional drift-flux model was developed and benchmarked with existing models in the present study. Different from existing empirical correlations, this newly developed 1-D drift-flux model started from the variations of two-phase flow distribution parameter C₀ for non-dimensional superficial gas velocity from low to high, which represents the variation of phase distribution patterns. Due to a combination of small-scale sub-channel effect and large-scale casing effect in a rod bundle, the Hibiki-Ishii¡¯s drift velocity was introduced to describe the relative motion between two phases. A clear boundary of distribution parameter, C₀, can be found when the non-dimensional superficial gas velocity is closed to 0.5. A linearly increasing trend and an exponentially decreasing trend of C₀ were found in the lower and higher gas sides divided by this boundary, respectively. Through the present model, one dimensional area-averaged gas velocity and void fraction can be determined for rod bundles in pool conditions. The prediction results were compared with several existing models and experimental data. The present model shows a good agreement with the existing experimental data and can be applied to both boiling and adiabatic air-water two-phase flows. In order to explain the peak values of C₀ in low superficial gas velocity conditions, several possible superficial velocity and void fraction profiles were examined by considering the recirculation flow/void distributions.