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Two-group drift-flux model in boiling flow

机译:沸腾流动中的两组漂移通量模型

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The two-group two-fluid model with interfacial area transport equation has been developed to improve the prediction of void fraction and heat transfer characteristics in two-phase systems. In the one-dimen sional formulation, a closure relation is required for the group-1 and group-2 area-average local relative velocity. Furthermore, in the case of the modified two-fluid model with the gas-mixture momentum equation, the group-1 and group-2 void weighted gas velocities must be calculated with additional closure relations. The drift-flux general expression is extended to two bubble groups in order to describe the group-1 and group-2 void weighted gas velocities and area-averaged local relative velocities. Corre lations for group-1 and group-2 distribution parameters and drift velocities are proposed and evaluated with a two-group boiling dataset taken in an internally heated annulus. The proposed distribution parameters show an average agreement within ±5%. The overall estimation of group-1 and group-2 void weighted gas velocities calculated with the newly proposed two-group drift-flux general expression shows an average agreement within ±16% of the measured value. The equations obtained for area-aver aged relative velocity of group-1 and group-2 bubbles were simplified by neglecting covariance in void fraction. This assumption was compared with the experimental database and resulted in an average error within ±13%.
机译:为了改善两相系统中空隙率和传热特性的预测,建立了具有界面面积传输方程的两组二流体模型。在一维公式中,第1组和第2组面积平均局部相对速度需要封闭关系。此外,在带有混合气动量方程的改进的双流体模型的情况下,必须通过附加的封闭关系来计算第1组和第2组空隙加权气体的速度。漂流通量的一般表达式扩展到两个气泡组,以描述第1组和第2组空隙加权气体速度和面积平均局部相对速度。提出了第1组和第2组分布参数与漂移速度的相关性,并使用在内部加热的环空中获取的两组沸腾数据集进行了评估。建议的分配参数显示出在±5%之内的平均一致性。用新提出的两组漂移通量通用表达式计算出的第1组和第2组空隙加权气体速度的总体估计值显示出在测量值的±16%范围内的平均一致性。忽略空隙率的协方差,简化了第1组和第2组气泡的面积平均老化相对速度获得的方程。将该假设与实验数据库进行比较,得出的平均误差在±13%以内。

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