Natural convection of paramagnetic fluid along a vertical heated wall under a magnetic field from a single permanent magnet
Natural convection of paramagnetic fluid along a vertical heated wall under a magnetic field from a single permanent magnet
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DOI：
10.1016/j.jmmm.2020.166574
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发表时间：
2020-05
影响因子：
2.7
通讯作者：
M. Kaneda;Hiroaki Fujiwara;Kengo Wada;K. Suga
中科院分区：
文献类型：
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作者：
M. Kaneda;Hiroaki Fujiwara;Kengo Wada;K. Suga
数值研究了块状永磁体磁场作用下顺磁流体的自然对流。在恒定热通量下部分加热空腔的一个垂直壁，以考虑单个垂直加热壁。将永磁块体放置在加热壁后，数值计算了加热壁的磁场。由于磁力在块磁体的边缘处是显著的，所以如果壁加热存在温差，则磁热力也是显著的。重叠的磁热力用于排斥流体。这导致在上磁体边缘附近的热传递增强，并且在下磁体边缘附近的热传递抑制。在磁感应强度大、壁面热流密度高、磁体相对于加热壁面高度高的情况下，抑制效果比增强效果更显著。
The natural convection of a paramagnetic fluid is numerically investigated in the presence of a magnetic field from a block permanent magnet. One vertical wall of a cavity is partially heated at a constant heat flux to consider a single vertical heated wall. The permanent block magnet is placed behind the heated wall, of which the magnetic field is numerically obtained. Since the magnetic force is remarkable at edges of the block magnet, the magnetothermal force is also pronounced if the temperature difference exists by wall heating. The overlapping magnetothermal force works to repel the fluid. This results in the heat transfer enhancement near the upper magnet edge, and suppression near the lower magnet edge. The suppressing effect becomes remarkable rather than the enhancing one in cases of large magnetic induction, high wall heat flux, and high magnet elevation to the heated wall.