Numerical analysis of deterioration phenomena in heat transfer to supercritical water
Numerical analysis of deterioration phenomena in heat transfer to supercritical water
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DOI：
10.1016/0017-9310(95)00008-w
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发表时间：
1995-11
影响因子：
5.2
通讯作者：
S. Koshizuka;N. Takano;Y. Oka
中科院分区：
文献类型：
--
作者：
S. Koshizuka;N. Takano;Y. Oka
对竖直管内超临界水冷却时的传热恶化现象进行了数值分析。该计算基于r-z二维稳态方程的抛物线解算器，湍流的k-ε模型和超临界水物理性质的蒸汽表库。计算结果与Yamagata等人的实验数据相吻合，发现传热恶化是由两种机制引起的，取决于流量。当热通量增加到远高于劣化热通量时，在温度分布中观察到剧烈振荡。
Deterioration in heat transfer at supercritical water cooling in a vertical pipe is numerically analyzed. The calculation is based on a parabolic solver for steady-state equations in r−z two dimensions, a k−ϵ model for turbulence and a steam table library for physical properties of supercritical water. Calculation results agree with the experimental data of Yamagata et al. It is found that heat transfer deterioration is caused by two mechanisms depending on the flow rate. When the heat flux is increased much above the deterioration heat flux, a violent oscillation is observed in the temperature distribution.