Magnetothermal convection on the thermally stratified fluid layer by permanent magnets

IF 1.5 4区 工程技术 Q3 ENGINEERING, MECHANICAL
Masayuki Kaneda, Kengo Wada, Kensuke Nazato
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引用次数: 0

Abstract

The Magnetothermal convection can be induced for paramagnetic fluid in the presence of the temperature difference and the magnetic field. In this study, the convection is studied both experimentally and numerically for the thermally stratified fluid layer attained by heating the top wall and cooling the bottom wall. When a single block magnet is placed above the top hot wall, the convection is confirmed near the magnet edges. In the case of multiple magnets, the convection is observed near the magnet junction(s) since the local magnetic force becomes stronger than that at magnet edges. This effect depends on the number of magnets. A pair block magnet that has one junction enhances the convection the most and pair vortex flow is induced. In the case of three magnets, the maxima of the local Nusselt number near the magnet junctions are suppressed. This is because that the magnetothermal force becomes weak due to the low-temperature difference formed by the conflicting convection cells.
永磁体对热分层流体层的磁热对流
在温差和磁场存在的情况下,顺磁流体会产生磁热对流。本文对加热顶壁、冷却底壁形成的热分层流体层的对流进行了实验和数值研究。当在顶部热壁上方放置一块块磁体时,在磁体边缘附近确认对流。在多个磁体的情况下,由于局部磁力比磁体边缘的磁力更强,因此在磁体连接处附近观察到对流。这种效应取决于磁铁的数量。具有一个结的对块磁体对对流的增强作用最大,诱导对涡旋流动。在三个磁体的情况下,局部努塞尔数在磁体结附近的最大值被抑制。这是由于相互冲突的对流单体形成的低温差异使磁热力变弱。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Enhanced Heat Transfer
Journal of Enhanced Heat Transfer 工程技术-工程:机械
CiteScore
3.60
自引率
8.70%
发文量
51
审稿时长
12 months
期刊介绍: The Journal of Enhanced Heat Transfer will consider a wide range of scholarly papers related to the subject of "enhanced heat and mass transfer" in natural and forced convection of liquids and gases, boiling, condensation, radiative heat transfer. Areas of interest include: ■Specially configured surface geometries, electric or magnetic fields, and fluid additives - all aimed at enhancing heat transfer rates. Papers may include theoretical modeling, experimental techniques, experimental data, and/or application of enhanced heat transfer technology. ■The general topic of "high performance" heat transfer concepts or systems is also encouraged.
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