棒束通道内两相流动摩擦阻力特性分析

常温常压下,对竖直3×3棒束通道内气液两相流动阻力特性进行了实验研究。利用所获得的实验数据,对8种典型的两相流动摩擦压降计算模型进行了评价。结果表明,均相模型在两相流速较高时精度较高,在两相流速较低时则偏差较大。分相模型中,Friedel模型和Lombodi-Pedrocchi模型不适用于本实验条件下棒束通道内气液两相流动摩擦压降的计算。Chisholm C模型、Zhang-Mishima模型、ChisholmB模型、Mishima-Hibiki模型及L.Sun模型的预测值与实验值的平均相对误差介于20%~30%之间。基于实验数据,通过修正ChisholmC模型的C系数,给出一个新的修正模型,其计算值与实验值符合良好。

Analysis of Frictional Resistance of Two-phase Flow in Rod Bundle Channel

The experimental investigation of air-water two-phase flow resistance characteristics in a vertical channel with a 3×3 rod bundle was carried out under atmospheric and room temperature conditions. Eight classical correlations for predicting frictional pressure drop of two-phase flow were evaluated against the experimental data. The experimental results show that the homogeneous model can predict the experimental data well at high flow rates, but with relatively large deviations at low flow rates. Both the Friedel model and the Lombodi-Pedrocchi model are not suitable any longer for the present case. The Chisholm C model, the Zhang-Mishima model, the Chisholm B model, the Mishima-Hibiki model and the L. Sun model can well predict the experimental data with mean relative errors in the range of 20%-30%. The C factor in the Chisholm C model was modified for giving a new correlation to predict the frictional pressure drop of two-phase flow through rod bundles, showing a good agreement with the experimental data.