Simulation of Subcooled Boiling and Critical Heat Flux in Uniformly Heated Tubes
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摘要: 基于欧拉两流体模型和非平衡过冷沸腾模型,完成过冷沸腾数值模型的构建,并通过与Bartolomei单管过冷沸腾实验进行对比,验证模型的正确性。利用该模型计算得到圆管的沸腾曲线,将进入"临界区"后的第一个点作为偏离泡核沸腾(DNB)判定的标准,对高压、高流量下圆管内的DNB型临界热流密度(CHF)进行数值模拟,CHF数据取自最新(2006年)的查询表;计算中考虑质量流量、平衡含汽率和压力对CHF的影响,最终预测值与实际值符合良好,误差在15%以内。预测CHF出现的位置也与实际相符,表明本文提出的方法能够很好地模拟高压、高流量下圆管内的DNB型CHF。Abstract: Based on Eulerian two-fluid framework and non-equilibrium subcooled boiling model, the numerical model is established to simulate the subcooled boiling. This model is used to simulate the subcooled flow and CHF of DNB type in uniformly heated tubes. The numerical model is proved correct by comparing to the subcooled flow experiment of Bartolomei. The boiling curves is calculated, and it is suggested to treat the first point in the critical area of boiling curves as the criterion of DNB. 12 CHF points drawn from the latest 2006 CHF look-up table are simulated. These 12 points are chosen with different mass flux, pressure or local equilibrium quality, but all are under high pressures and high mass flux. The CHF predicted confirm well to the experiment and the location that CHF occur is also well captured.
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Key words:
- Non-equilibrium subcooled boiling /
- Subcooled boiling /
- CHF /
- DNB /
- Boiling curves
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