S083035 Cross-sectional Shape Effect on Particle Deposition onto Side Wall

Abstract

The boiling transition of BWR fuel occurs, when the liquid film flow becomes zero. To predict the boiling transition power, called critical power, the subchannel analysis method has been developed. However, that method depends on the empirical correlations, for instance, droplet deposition, droplet entrainment, flow regime and so on. This study focuses on the droplet deposition, especially, cross-section shape effect on the droplet deposition onto a channel wall. Usual droplet deposition rate correlations were developed based on the measurement data with simple flow channel, like a tube. However, actual cross-section shape of BWR channel is not round tube Moreover, it seems to be very difficult to perfume the droplet deposition measurement test with such an actual channel. Therefore, the cross-sectional geometry effect on the droplet deposition was investigated numerically. The numerical results showed the droplet deposition rate on the rod bundle was smaller than that on the round tube It means that we must consider the cross-section shape effect on the droplet deposition.