Thermal convection in a toroidal duct of a liquid metal blanket. Part II. Effect of axial mean flow
Thermal convection in a toroidal duct of a liquid metal blanket. Part II. Effect of axial mean flow
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液态金属毯环形管道中的热对流。
DOI：
10.1016/j.fusengdes.2017.01.025
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发表时间：
2017
影响因子：
1.7
通讯作者：
O. Zikanov
中科院分区：
文献类型：
--
作者：
Xuan Zhang;O. Zikanov
本文的工作继续探索了热对流对液态金属包层环形管道内流动的影响。这一次我们考虑沿管道沿着的平均流动的影响和转移俘获中子所沉积的热量的相关热传递的影响。数值模拟进行了一个模型系统的二维（流向均匀）充分发展的流动，纯环形磁场，和完美的电和热绝缘的墙壁。实际上使用了高的Grashof（高达1011）和Reynolds（高达106）数。研究发现，在中等格拉肖夫数下，流动在横向平面内发展热对流。在较大的Grashof数下，流动主要由流向速度的上下不对称性和温度的稳定分层所控制，这是由于平均温度沿管道沿着增长而产生的浮力所引起的。这导致热对流的抑制、弱混合和壁温的显著梯度。建议根据更现实的模型进行进一步分析。
The work continues the exploration of the effect of thermal convection on flows in toroidal ducts of a liquid metal blanket. This time we consider the effect of the mean flow along the duct and of the associated heat transfer diverting the heat deposited by captured neutrons. Numerical simulations are conducted for a model system with two-dimensional (streamwise-uniform) fully developed flow, purely toroidal magnetic field, and perfectly electrically and thermally insulating walls. Realistically high Grashof (up to 1011) and Reynolds (up to 106) numbers are used. It is found that the flow develops thermal convection in the transverse plane at moderate Grashof numbers. At large Grashof numbers, the flow is dominated by the top-bottom asymmetry of the streamwise velocity and stable stratification of temperature, which are caused by the buoyancy force due to the mean temperature growing along the duct. This leads to suppression of thermal convection, weak mixing, and substantial gradients of wall temperature. Further analysis based on more realistic models is suggested.
影响因子：
3.7
作者：
D. Krasnov;O. Zikanov;T. Boeck
通讯作者：
D. Krasnov;O. Zikanov;T. Boeck