Abstract
RPI model is a numerical model applied to analysis of subcooled nucleate boiling heat transfer. To evaluate the accuracy of this model, experiments and numerical analyses on vertical upward boiling flow were performed in this study. The test section of experimental system has an annular channel consisted of an acrylic tube and a rod heater located in the center of the tube. The tube is 1500mm in length and 24mm in inner diameter, and the heater is 12mm in outer diameter. FC-72 under atmospheric pressure condition was used as a working fluid. In analyses, thermal-hydraulic calculations were conducted by using RPI model and a commercial code, FLUENT. By comparing analytical and experimental results, it was found the radial distributions of void fraction obtained from analyses were in good agreement with the experimental data as long as the value was smaller than 0.2. However, the rise of void fraction caused increase of the error between calculated and experimental results greatly. These results mention that RPI model cannot be applied to calculation in the condition of high void fraction.
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