[3E01-07] Two Phase Flow

11:10 AM - 11:25 AM JST(2:10 AM - 2:25 AM UTC)

[3E06] Evaluation of steam-water annular flow characteristics under BWR operating conditions based on experiments with simulant fluids

*Huacheng Zhang¹, Yutaro Umehara¹, Shoji Mori¹, Naoki Horiguchi², Hiroyuki Yoshida² (1. Kyushu Univ., 2. JAEA)

Keywords:

Two-phase flow,Annular flow,Boiling water reactor,Liquid film,Disturbance wave

Due to the extreme operating conditions of BWRs (285°C and 7 MPa), the direct visualization and detailed liquid film measurement of steam–water annular flow in Boiling Water Reactors (BWRs) have been highly challenging. This study addresses this limitation by developing a novel HFC134a–ethanol annular flow system at lower temperature and pressure (40°C and 0.7 MPa), simulating the steam–water annular flow under BWR conditions. The experiments of HFC134a–ethanol upward annular flow were conducted in a 5 mm inner diameter tube using the constant electric current method, and we obtained the flow characteristics, including base, average, and maximum film thickness and the height of disturbance wave.