Abstract A phenomenological model to account for the effect of a grid spacer with mixing vanes on CHF has been developed. It takes into the account of the mixing vane configuration (i.e., angle, number, position, etc.) on the flow field, the turbulent mixing between subchannels and heat transfer. Changes in flow field, turbulent mixing and heat transfer have led to CHF enhancement in subchannels and hence the bundle. The model has been implemented into the subchannel code ATHAS and assessed against the bundle CHF at conditions of interest to Pressurized Water Reactors (PWRs). Prediction of CHF in subchannel is based on the 2006 CHF look-up table and the mixing-vane spacer model. The assessment applies the direct substitution method (DSM) and the heat balance method (HBM). At the same time, significant improvement in CHF prediction accuracy was found for 467 data points.

中文翻译：

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杆束子通道中混合叶片隔板的唯象 CHF 模型

摘要 已经开发了一种现象学模型，用于解释带有混合叶片的网格隔板对 CHF 的影响。它考虑了流场上的混合叶片配置（即角度、数量、位置等）、子通道之间的湍流混合和传热。流场、湍流混合和传热的变化导致子通道和束中的 CHF 增强。该模型已被实施到子通道代码 ATHAS 中，并在压水反应堆 (PWR) 感兴趣的条件下根据捆绑 CHF 进行评估。子通道中 CHF 的预测基于 2006 CHF 查找表和混合叶片间隔模型。评估采用直接替代法 (DSM) 和热平衡法 (HBM)。同时，