Effects of symmetry on magnetohydrodynamic mixed convection flow in a vertical duct
Effects of symmetry on magnetohydrodynamic mixed convection flow in a vertical duct
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DOI：
10.1063/5.0020608
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发表时间：
2020-09
影响因子：
4.6
通讯作者：
I. Belyaev;D. Krasnov;Y. Kolesnikov;D. Biryukov;D. Chernysh;O. Zikanov;Y. Listratov
中科院分区：
文献类型：
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作者：
I. Belyaev;D. Krasnov;Y. Kolesnikov;D. Biryukov;D. Chernysh;O. Zikanov;Y. Listratov
对垂直管道中向下流动的金属液磁流体动力学对流进行了实验和数值研究。从早期的研究中可知，在一定的参数范围内，流动表现出孤立爆发或准规则波动形式的高振幅温度脉动。这项研究扩展了分析，同时侧重于对称性的影响，而不是片面的壁加热。研究发现，温度脉动是两种加热类型和各种入口条件下出现的鲁棒物理现象。同时，在对称加热和非对称加热下，参数空间中的性质、典型振幅和存在范围有很大不同。所获得的数据显示出良好的计算和实验之间的协议，并允许我们解释的物理机制引起的脉动行为。
Magnetohydrodynamic convection in a downward flow of liquid metal in a vertical duct is investigated experimentally and numerically. It is known from earlier studies that in a certain range of parameters, the flow exhibits high-amplitude pulsations of temperature in the form of isolated bursts or quasi-regular fluctuations. This study extends the analysis while focusing on the effects of symmetry introduced by two-sided rather than one-sided wall heating. It is found that the temperature pulsations are robust physical phenomena appearing for both types of heating and various inlet conditions. At the same time, the properties, typical amplitude, and range of existence in the parametric space are very different at the symmetric and asymmetric heating. The obtained data show good agreement between computations and experiments and allow us to explain the physical mechanisms causing the pulsation behavior.