DNB Prediction Using Local Void Distribution in High Quality Flow
NURETH-14 - 2011 September 25-30

Presented at:
2011 September 25-30
Toronto, Canada
Session Title:
D8-1 Multi-Scale Multi-Physics Couplings; Multi-Physics Applications to LWR Fuel and Subchannel Anal

Tatsuya Sasakawa (Nuclear Fuel Industries, Ltd)
Tsutomu Ikeno (Nuclear Fuel Industries, Ltd)
Isao Kataoka (Osaka University)


A coupled code between a sub-channel analysis code and a computational multi-fluid dynamics code was developed for predicting departure from nucleate boiling (DNB). Local void fraction near the wall was used to define the onset of DNB. The local void fraction distribution in a sub-channel was determined by a bubble diffusion equation. To cover the flow regime at the high quality condition, a new source term was introduced. The present method was applied to the analysis of DNB test data including high quality condition. The result showed remarkable improvement of predictability by introducing the new source term.

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