Numerical Study on DNB-Type Critical Heat Flux in Circular Tube under Rolling Condition
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摘要: 针对摇摆条件下的竖直圆管内偏离核态沸腾（DNB）临界热流密度（CHF）进行了三维数值计算，采用欧拉两相流模型和非平衡壁面沸腾模型，通过将静止管道的CHF模拟值和实验值进行对比，完成了不同壁面沸腾子模型的敏感性分析。对15种振幅和周期组合的正弦简谐摇摆运动的竖直管道的CHF进行预测。结果表明：所有摇摆条件均导致了DNB现象的提前发生，在最“剧烈”的摇摆情况下，CHF的值最小。管道内的温度和换热系数会随着摇摆运动发生周期性的改变。在一个周期内，更大的振幅和更小的周期都会导致加热壁面在某时刻出现更小的换热系数，从而导致壁面最高温度上升。本研究可以为摇摆条件下DNB型CHF的数值预测提供参考。
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关键词:
- 偏离核态沸腾（DNB） /
- 临界热流密度（CHF） /
- 摇摆条件 /
- 数值研究
Abstract: A three-dimensional numerical calculation was carried out on the departure from nucleate boiling (DNB) type critical heat flux (CHF) in a vertical circular tube under different rolling conditions. The Euler two-phase flow model and the non-equilibrium wall boiling model were used. By comparing the simulated CHF values of static tubes with experimental values, a sensitivity analysis of different wall boiling sub-models was completed. The CHF of a vertical tube with sinusoidal simple harmonic rolling motion is predicted for 15 combinations of amplitude and period. The results show that all rolling conditions lead to the early occurrence of DNB. In the most "violent" rolling situation, the value of CHF is the smallest. The temperature and heat transfer coefficient in the tube will change periodically with the rolling motion. Within a period, larger amplitude and smaller period will cause the heating wall to have a smaller heat transfer coefficient at a certain moment, resulting in an increase in the maximum temperature of the wall. This study can provide a reference for the numerical prediction of DNB-type CHF under rolling conditions. -
表 1 相间模型的选取
Table 1. Selection of Interphase Models
作用力模型 模型 曳力 Grace 升力 Tomiyama 湍流耗散力 Favre 壁面润滑力 Antal 虚拟质量力 — 
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表 2 实验工况
Table 2. Experimental Case
参数 数据 系统压力/MPa 0.58 饱和温度 /K 431 入口质量流量/(kg·m−2·s−1) 11479.8 入口温度/K 339.18 测的CHF/(MW·m−2) 12.1
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表 3 壁面沸腾子模型敏感性分析
Table 3. Sensitivity Analysis on the Wall Boiling Sub-models
气泡脱离
直径模型核化
密度模型CHF发生
位置/m$q_{\mathrm{c}}/ $
(MW·m−2)与实验数据
的偏差/%T-K K-I 0.1995 8.4 30.57 K-I 0.1835 8.8 27.27 Unal 0.1980 11.1 8.26 T-K L-C 0.1920 6.6 45.45 K-I 0.1850 5.8 52.07 Unal 0.1910 8.6 28.93
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表 4 摇摆工况
Table 4. Rolling Conditions
工况 T/s 振幅 工况 T/s 振幅 1 9 7.5 30° 2 4.5 40° 10 9.0 30° 3 6.0 40° 11 12.0 30° 4 7.5 40° 12 4.5 20° 5 9.0 40° 13 6.0 20° 6 12.0 40° 14 7.5 20° 7 4.5 30° 15 9.0 20° 8 6.0 30° 16 12.0 20°
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