带定位格架的棒束通道内泡状流条件下界面浓度输运模型

Interfacial Area Transport Equation for Bubble Flow in Rod Bundles with Spacer Grids

在两流体模型中,表征两相间界面传递项的界面浓度是非常重要的参数之一。本文开发了含定位格架的棒束通道内泡状流条件下一维界面浓度输运方程,包含对方程中的源项和汇项,即气泡聚合项和气泡破裂项,并进行建模。基于四探头电导探针测量系统对5×5棒束通道开展了空气-水两相空泡特性实验研究,获得了不同工况条件下界面浓度沿轴向方向的实验数据。通过与实验数据对比,新开发的界面浓度输运模型能够对界面浓度进行很好地预测,相对误差为±16.9%。

In the two-fluid model,the interfacial area concentration is one of the most important parameters to characterize the two-phase interface transfer term.One-dimensional interfacial area transport equation was developed by modeling the sink and source terms including bubble breakup and coalescence.An experiment of vertical adiabatic air-water flow was conducted under an atmosphere pressure condition based on four-probe conductivity probe measurement system.The experimental data were obtained at different axial locations under different flow conditions.By comparing with the experimental data,the newly developed interface area transport model can predict the interfacial area concentration well with the relative error of±16.9%.