基于微液层理论的下封头外部流体CHF理论计算

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Theoretical Study on Critical Heat Flux for Reactor Lower Head Using Subscale Boundary Layer Boiling Model

Department of Nuclear Science and Technology, Xi'an Jiaotong University, Xi'an, 710049, China

摘要: 在微液层(蒸干)模型的基础上,利用微液层中气-液相的守恒关系推导得到初始两相流边界层厚度,同时选取最大的夹带系数时的空泡份额,对下封头在饱和池式沸腾下的临界热流密度(CHF)进行理论预测。结果表明,两相边界层厚度开始发生变化时的角度会随半径的增加而增加;CHF的大小会随角度的增加而增加,最大值出现在90°处。通过CHF预测结果比较发现,改进的蒸干模型的预测结果更好。
- 微液层理论 /
- 临界热流密度 /
- 理论计算
Abstract: Based on the subscale boundary layer model,a preliminary boundary layer thickness analysis is performed,which is treated with the conservation equation,in order to calculate the CHF.Predictive results of CHF are obtained by selecting the largest entrainment coefficient.The angle,which implicates the change beginning of the two-phase boundary layer thickness,will increase with the increasing radius.The result of CHF increases observably with the angle,and the maximum value appears in 90 degrees.Comparing the predictive results with the experimental data,a better result of CHF prediction is obtained with the improved subscale boundary layer model.
- Subscale boundary Layer theory /
- Critical Heat Flux /
- Theoretical calculation