Thermodiffusion in ferrofluids in the presence of a magnetic field
Thermodiffusion in ferrofluids in the presence of a magnetic field
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DOI：
10.1063/1.1864092
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发表时间：
2005-02
影响因子：
4.6
通讯作者：
T. Voelker;S. Odenbach
中科院分区：
文献类型：
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作者：
T. Voelker;S. Odenbach
研究目的是研究磁场影响下铁磁流体中磁性颗粒的热扩散过程（索雷特效应）。理论上预测，所谓的磁索雷效应比传统的索雷效应小两到三个数量级。相比之下，之前的实验定性地表明，磁对热扩散过程的影响远高于磁索雷效应的理论预测。然而，在这些实验中，浮力和磁驱动对流的影响显着干扰了测量。因此，磁场对热扩散的影响有多强以及如何从理论上解释这种影响仍然是一个悬而未决的问题。因此，开发了一种实验装置，可以最大限度地减少寄生效应，简化实验结果的分析。这些结果提供了索雷效应的磁场依赖性的定量测量...
Investigations were made to investigate the thermodiffusion process (Soret effect) of magnetic particles in a ferrofluid under the influence of a magnetic field. The so-called magnetic Soret effect was theoretically predicted to be two to three orders of magnitude smaller than the conventional Soret effect. In contrast, former experiments have qualitatively shown that the magnetic influence on the thermodiffusion process is much higher than the theoretical predictions for the magnetic Soret effect. However, in those experiments the influence of buoyancy and magnetic driven convection disturbed the measurement significantly. Thus it is still an open question how strong the influence of a magnetic field on thermodiffusion can be and how this influence can be explained theoretically. Therefore an experimental setup was developed which minimizes parasitic effects, simplifying the analysis of the experimental results. These results provide quantitative measures of the magnetic field dependence of the Soret eff...