Presentation Information

4:30 PM - 4:45 PM JST(7:30 AM - 7:45 AM UTC)

[1C09]A Study on the Effect of Heated Length on Boiling Entrainment Rate in Falling Liquid Film

*Kaito Nade¹, Yuki Narushima², Tomio Okawa¹, Kenichi Katono² (1. UEC, 2. Hitachi)

Keywords:

Boiling entrainment,Liquid film dryout,Heat flux,Two-phase flow,Boiling Water Reactor

Accurate prediction of liquid film dryout on fuel rod surfaces in the flow channels of BWR fuel assembly is essential for safety design. In annular flow, the liquid film decreases due to droplet entrainment and evaporation, and its disappearance leads to a risk of surface burnout. Therefore, understanding the mechanisms of droplet entrainment is critical importance. While previous studies have mainly focused on entrainment caused by gas-flow shear stress, entrainment due to nucleate boiling becomes significant under high heat flux conditions. This study investigates nucleate boiling within the liquid film under forced convective conditions and aims to experimentally clarify the boiling entrainment rate. In paricular, we present experimental results on the influence of heating length on the boiling entrainment rate.

Back to Session information