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以去离子水为工质,对常压下竖直窄缝通道内过冷沸腾流动与换热规律进行实验和数值模拟研究。对壁面气泡核化特点进行可视化实验分析,建立2 mm窄缝通道的壁面核化沸腾模型,包括:汽化核心密度、气泡脱离直径和气泡脱离频率关联式。以两流体模型为基础,结合壁面热量分配伦斯勒理工学院(RPI)模型以及壁面核化沸腾模型,建立竖直窄缝通道内过冷沸腾流动传热计算流体动力学(CFD)数值模型,对典型实验工况进行模拟分析,并与实验结果进行对比,两者吻合良好。
Using deionized water as working fluid, experimental and numerical simulations of subcooled boiling heat transfer and flow in a vertical narrow channel at atmospheric pressure were carried out. Visualization experiment of bubble nucleation on the wall was carried out to establish the wall nucleation boiling model of 2 mm narrow channel, including the relationship of vaporization core density, bubble diameter and bubble breakaway frequency. Based on the two-fluid model and the RPI model and the kernel nucleation boiling model, the numerical model of subcooled boiling heat transfer fluid dynamics (CFD) in a vertical narrow channel was established. The typical experimental conditions were simulated and compared with the experimental results, the two agree well.