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首页> 外文期刊>Journal of Heat Transfer >Numerical and Experimental Analyses of Magnetic Convection of Paramagnetic Fluid in a Cylinder
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Numerical and Experimental Analyses of Magnetic Convection of Paramagnetic Fluid in a Cylinder

机译：圆柱体内顺磁性流体对流的数值和实验分析

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摘要

The magnetic convection of paramagnetic fluid in a cylindrical enclosure is studied experimentally and numerically. The upper side wall of the cylinder is cooled and the lower side wall heated, an unstable configuration. The whole system is placed coaxially in a bore of a superconducting magnet in the position of the minimum radial component of magnetic buoyancy force at the middle cross section of the enclosure. The stable configuration - when the whole system is placed inversely and the horizontal axial case are also considered. As a paramagnetic fluid an aqueous solution of glycerol with the gadolinium nitrate hexahydrate is used. The isotherms in the middle-height cross section are visualized by thermochromic liquid crystal slurry. For the unstable configuration the magnetic buoyancy force acts to assist the gravitational buoyancy force to give multiple spoke patterns at the mid cross section. The stable configuration gives an almost stagnant state without the magnetic field. Application of the magnetic field induces the convective flow similar to the unstable configuration. For the horizontal configuration a large roll convective flow (without the magnetic field) is changed under the magnetic field to the spoke pattern. The numerical results correspond to the experimental results.
机译：对圆柱壳内顺磁性流体的磁对流进行了实验和数值研究。汽缸的上侧壁被冷却而下侧壁被加热，这是不稳定的构造。整个系统同轴地放置在超导磁体的孔中，位于外壳中间横截面处的磁性浮力的最小径向分量的位置。稳定的配置-整个系统反向放置时，也要考虑水平轴向情况。作为顺磁性流体，使用甘油与硝酸hydrate六水合物的水溶液。通过热致变色液晶浆液可以看到中等高度横截面的等温线。对于不稳定的构造，磁性浮力起到辅助重力浮力的作用，以在中间截面处提供多个辐条图案。稳定的配置在没有磁场的情况下几乎处于停滞状态。施加磁场会引起类似于不稳定结构的对流。对于水平配置，在磁场下将大的滚动对流（无磁场）更改为辐条图案。数值结果与实验结果相对应。

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