A BUBBLE MECHANISTIC MODEL FOR SUBCOOLED BOILING FLOW PREDICTIONS
A BUBBLE MECHANISTIC MODEL FOR SUBCOOLED BOILING FLOW PREDICTIONS
复制标题
过冷沸腾流动预测的气泡机理模型
DOI：
10.1080/10407790490268959
复制
发表时间：
2004
期刊：
影响因子：
--
通讯作者：
J. Tu
中科院分区：
文献类型：
--
作者：
G. Yeoh;J. Tu
将颗粒平衡方程与三维双流体模型相结合，对垂直环形通道内低压过冷沸腾流动进行了数值模拟。对CFX4.4中实现的MUSIG(多尺寸群)模型进行了扩展，以考虑过冷沸腾区域的壁面成核和凝结。在不同的质量、热流密度和进口过冷温度范围内，对空泡率、气泡Sauter直径、界面浓度、气泡密度、气液速度进行了模型预测和局部测量的比较。计算得到的局部径向含气率、气泡Sauter直径、界面浓度、气泡密度和液体速度分布与测量结果吻合较好。然而，利用目前的气泡机理模型对汽相速度的准确预测还需要进一步的改进。提出了在Musig沸腾模型中引入代数滑移模型来解释气泡分离的建议。
Population balance equations combined with a three-dimensional two-fluid model are employed to predict subcooled boiling flow at low pressure in a vertical annular channel. The MUSIG (Multiple-Size-Group) model implemented in CFX4.4 is extended to account for the wall nucleation and condensation in the subcooled boiling regime. Comparison of model predictions against local measurements is made for the void fraction, bubble Sauter diameter, interfacial area concentration, bubble population density, and gas and liquid velocities covering a range of different mass and heat fluxes and inlet subcooling temperatures. Good agreement is achieved with the local radial void fraction, bubble Sauter diameter, interfacial area concentration, bubble population density, and liquid velocity profiles against measurements. However, further improvement is needed for the accurate prediction of the vapor velocity using the present bubble mechanistic model. A proposal to include an algebraic slip model to account for bubble separation in the MUSIG boiling model is presented.