Dynamical and thermal performance of molten salt pipe during filling process
Dynamical and thermal performance of molten salt pipe during filling process
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DOI：
10.1016/j.ijheatmasstransfer.2009.03.005
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发表时间：
2009-07
影响因子：
5.2
通讯作者：
Jianfeng Lu;J. Ding
中科院分区：
文献类型：
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作者：
Jianfeng Lu;J. Ding
采用流体体积模型对熔盐管道充型过程中的动力学和热力学性能进行了数值研究。整个充型过程分为三个主要阶段，即界面宽度迅速增大的发展阶段、界面宽度波动的波动阶段和界面稳定的充分发展阶段，并详细描述了相应的界面结构、流场和温度场。在熔盐流过某一位置之前，流体温度会在短时间内发生跳跃，而在此之后壁面温度只呈线性增加。充型过程中的传热主要取决于管壁和熔盐流动，而外部的自然对流几乎可以忽略。无量纲界面温度在不同环境温度下有相似的演化过程，但随流速的增大而明显增大。此外，当界面温度低于凝固点时，管道会发生堵塞，因此通过关联界面温度的演化过程，推导出了穿透距离的计算模型，该模型与已有的实验结果吻合较好。
The dynamical and thermal performances of molten salt pipe during the filling process are numerically investigated using volume of fluid model. The whole filling process has three main stages, or the developing stage with the interface width quickly increasing, the fluctuating stage with the interface width fluctuating and the fully developed stage with stable interface, and then associated interface structures, flow and temperature fields are described in detail. Before the molten salt flows through a certain position, the fluid temperature will jump within a short time, while the wall temperature only linearly increases after that. The heat transport during the filling process is mainly dependent upon the pipe wall and molten salt flow, while natural convection outside can almost be ignored. The dimensionless interface temperature has similar evolution process under different surrounding temperatures, but it will apparently increase with the flow velocity rising. In addition, the pipe will be blocked when the interface temperature drops below the freezing point, so a model of penetration distance is derived by correlating the interface temperature evolution process, and it has a good agreement with available experimental results.