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采用两相流的流动换热理论,建立二维几何模型,运用FLUENT对稳定入口流速下注入气体的铅铋流动段作了模拟。模拟研究注入气体的体积份额或速度改变对压力和铅铋与注入气体之间换热与影响,得到了不同条件下的温度与压力分布。分析结果发现,体积份额减小,铅铋流体的径向温度分布更加均匀,中心温度更低;随着体积份额的减小,铅铋的总压呈现出一种下降的趋势。注入气体速度不同对铅铋整体的换热影响不大;中心处的动压有较大增加,总压改变甚微。

Numerical simulation of the impact gas injection on the lead-bismuth liquid flow and heat transfer parameters

Two-phase flow theory on heat transfer is used, and a two-dimensional model is created. The lead-bismuth liquid flow segment at stable entrance flow rate with gas injection was simulated with FLUENT code. The simulation studied the impact of the volume fraction or the relative velocity of the injected gas on the pressure and heat transfer between lead-bismuth and the injected gas, the temperature and pressure profiles under the different conditions were obtained. Analysis shows that with volume fraction decreases, the radial temperature profile is more uniform in the lead-bismuth fluid, at the center the fluid has a lower temperature, and the total pressure of lead-bismuth shows a tendency to decline. The results show that the velocity has a little effect on the heat transfer and the total pressure changes a little too??but the dynamic pressure increases a lot at the center.