Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Partition method of wall friction and interfacial drag force model for horizontal two-phase flows

  • Hibiki, Takashi (Department of Mechanical Engineering, City University of Hong Kong) ;
  • Jeong, Jae Jun (School of Mechanical Engineering, Pusan National University)
  • Received : 2021.06.22
  • Accepted : 2021.10.10
  • Published : 2022.04.25
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Abstract

The improvement of thermal-hydraulic analysis techniques is essential to ensure the safety and reliability of nuclear power plants. The one-dimensional two-fluid model has been adopted in state-of-the-art thermal-hydraulic system codes. Current constitutive equations used in the system codes reach a mature level. Some exceptions are the partition method of wall friction in the momentum equation of the two-fluid model and the interfacial drag force model for a horizontal two-phase flow. This study is focused on deriving the partition method of wall friction in the momentum equation of the two-fluid model and modeling the interfacial drag force model for a horizontal bubbly flow. The one-dimensional momentum equation in the two-fluid model is derived from the local momentum equation. The derived one-dimensional momentum equation demonstrates that total wall friction should be apportioned to gas and liquid phases based on the phasic volume fraction, which is the same as that used in the SPACE code. The constitutive equations for the interfacial drag force are also identified. Based on the assessments, the Rassame-Hibiki correlation, Hibiki-Ishii correlation, Ishii-Zuber correlation, and Rassame-Hibiki correlation are recommended for computing the distribution parameter, interfacial area concentration, drag coefficient, and relative velocity covariance of a horizontal bubbly flow, respectively.

Keywords

Acknowledgement

The work described in this paper was partially supported by a grant from City University of Hong Kong (Project No. 9380126) and Global STEM Professorship, Hong Kong. One of the authors (T. Hibiki) appreciates the support.

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