Abstract

The results of a study of the hydrodynamics and heat transfer in an upward mercury flow in a vertical pipe under the effect of a transverse magnetic field are presented. The problem simulates a liquid-metal flow in the poloidal channels of a blanket cooling system in a TOKAMAK fusion reactor. The experimental data on temperature fields and heat transfer obtained from probe measurements in a mercury magnetohydrodynamic test facility at JIHT RAS are given. These data are compared with the results of numerical modeling to determine the validity envelope for the computational model and to verify whether the experimental conditions were properly specified. Without a magnetic field, heat transfer is complicated by mixed turbulent convection; some regimes have a decrease in heat transfer of up to 30–40% in comparison with the forced-convection heat transfer. The effect of a transverse magnetic field drastically affects the regularities of heat transfer due to flow laminarization and the change in the velocity profile caused by the electromagnetic interaction. At the same time, in the studied region of flow conditions, mixed convection in uniformly heated pipes does not have a strong effect on the heat transfer in a magnetic field and does not induce fluctuating, return, or separated flows.

中文翻译：

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横向磁场中管道中向上流动的液态金属中的热传递

摘要

给出了在垂直磁场作用下垂直管道中向上的汞流中的流体动力学和传热研究的结果。该问题模拟了TOKAMAK聚变反应堆毯式冷却系统的极向通道中的液态金属流动。给出了在JIHT RAS的汞磁流体动力学测试设备中通过探针测量获得的温度场和传热的实验数据。将这些数据与数值建模的结果进行比较，以确定计算模型的有效性包络并验证是否正确指定了实验条件。如果没有磁场，混合湍流对流会使传热变得复杂。与强制对流传热相比，某些方案的传热减少了30-40％。横向磁场的影响极大地影响了由于流动层流以及电磁相互作用引起的速度分布变化而引起的传热规律。同时，在研究的流动条件区域中，均匀加热的管道中的混合对流不会对磁场中的热传递产生强烈影响，也不会引起波动，回流或分离流动。