Abstract
The helical structure of the petal-shape fuel element results in a high heat transfer performance. Therefore, it is crucial to analyze its thermal–hydraulic characteristics. However, research on subcooled boiling in the petal-shape fuel rod bundle assembly is few. The characteristic of subcooled flow boiling in rod bundle assembly with a 2 × 2 petal-shape fuel rod was investigated numerically by Computational Fluid Dynamics. The results show that the wall superheat at the onset of nucleate boiling (ONB) decreases with the increasing mass flux and inlet subcooling degree, but has the opposite effect with pressure. The prediction accuracy of existing ONB correlations was investigated. The majority of correlations, however, deviate from the simulated values. Because they were not intended for the ONB of the petal-shape fuel rod, they did not account for the effects of enhanced heat transfer
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