Experimental Study and Multidimensional Modeling of Turbulent Subcooled Boiling Flow

对湍流过冷泡状沸腾流动的流体力学和传热学方面进行了基础实验。实验将集中于液体和汽相的湍流速度场和温度场，以及汽相分数、气泡尺寸和时间平均界面浓度的空间分布。具有三个探测器、快速微型热电偶和相敏双传感器光纤探头的双分量激光多普勒测速仪将用于测量。通过仔细的观察和分析，将从实验数据中获得闭合规律和模型。将寻求这些定律和模型的量包括：雷诺应力和液体中的湍流热通量，局部时间平均界面面积浓度，以及汽液界面上的动量和热能的传递速率。封闭定律和模型将被合并到一个三维双流体计算程序中，该程序目前正在法国电力公司开发。最终目标将是利用实验室中获得的适当实验数据来验证这一计算代码。

Fundamental experiments on the fluid mechanical and heat transfer aspects of turbulent subcooled bubbly boiling flow were proposed. The experiments will focus on the turbulent velocity and temperature fields of the liquid and vapor phases and also on the spatial distributions of vapor fraction, bubble size, and time-average interfacial area concentration. A two-component laser Doppler Velocimeter featuring three detectors, fast micro-thermocouples, and phase-sensitive dual sensor fiber-optic probes will be used for the measurements. Closure laws and models will be obtained from the experimental data via careful scrutiny and analyses. Quantities for which these laws and models will be sought include: Reynolds stresses and turbulent heat flux in the liquid phase, local time-average interfacial area concentration, and transfer rates of momentum and thermal energy at the vapor-liquid interfaces. The closure laws and models will be incorporated in a three-dimensional two-fluid computational code that is presently under development at Electricit de France. The final goal will be to contribute toward the validation of this computational code with appropriate experimental data obtained in the laboratory.