Prediction of flow distribution of vertical upward co-current adiabatic annular flow in 8 × 8 rod bundle

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

1 Scopus Citations
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Author(s)

  • Peng Ju
  • Xiaohong Yang
  • Qingzi Zhu
  • Yikuan Yan
  • Yang Liu
  • Mamoru Ishii

Detail(s)

Original languageEnglish
Pages (from-to)555-562
Journal / PublicationAnnals of Nuclear Energy
Volume132
Online published29 Jun 2019
Publication statusPublished - Oct 2019
Externally publishedYes

Abstract

Annular flow in rod bundle occurs frequently in boiling water reactor (BWR) under normal operation and in pressurized water reactor (PWR) under accident conditions. When annular flow occurs, rod film thickness is one of the most important parameters for safety concern. In order to calculate rod film thickness distribution inside rod bundle, both gas and liquid velocity distribution inside rod bundle is necessary. Also, flow distribution inside rod bundle is of importance for calculation of interfacial shear stress and other parameters in each sub-channel. However, entrained droplets in gas core can sharpen the gas velocity profile while existing rods can flatten the gas velocity profile, making it different from that of single phase flow. The liquid velocity distribution inside rod bundle is hard to obtain from experiment because of the complex structure of its geometry. Due to these reasons, this paper deducts gas and liquid velocity profiles from existing adiabatic rod film thickness data. Even the gas velocity profiles for different flow conditions are different, there exists a gas velocity profile that can be applied to all current flow conditions with minimum uncertainties. Based on that gas velocity profile, liquid velocity profile can be calculated. From these flow velocity profiles, film thickness on each rod and interfacial shear stress in each sub-channel can be calculated.

Research Area(s)

  • Annular flow, Gas velocity profile, Liquid velocity profile, Rod bundle, Vertical upward co-current adiabatic flow

Citation Format(s)

Prediction of flow distribution of vertical upward co-current adiabatic annular flow in 8 × 8 rod bundle. / Ju, Peng; Yang, Xiaohong; Zhu, Qingzi; Yan, Yikuan; Liu, Yang; Ishii, Mamoru; Hibiki, Takashi.

In: Annals of Nuclear Energy, Vol. 132, 10.2019, p. 555-562.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review