A computational design of a magnetic field applied to control magnetic adsorbent used in liquid/gas adsorption processes
A computational design of a magnetic field applied to control magnetic adsorbent used in liquid/gas adsorption processes
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DOI：
10.1016/j.icheatmasstransfer.2014.02.008
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发表时间：
2014-04
影响因子：
7
通讯作者：
Junfeng Lu;Hao Zhang;Wen-qiang Lu
中科院分区：
文献类型：
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作者：
Junfeng Lu;Hao Zhang;Wen-qiang Lu
在我们最近的研究中，氧化铁磁性微粒作为种子分别与壳聚糖和活性碳结合在一起，用于血液透析后的营养恢复过程和混合气体吸附分析。最初，实验中使用的这些磁性吸附剂都是用分子筛过滤器密封在圆筒容器内的。然而，这种设计导致在吸附过程中液体或气体的流速非常慢。为了提高流量，本文提出了一种在液体或气体流动的反方向上施加非线性梯度磁场的新设计。设计的目的是将磁性吸附剂保持在容器内，保持高流速。利用安培电路定律和朗之万方程，推导出无限长螺线管线圈内部的磁场。本文给出了一个表示磁场安匝数与其位置关系的方程式。最后证明了该方程适用于有限长磁场的实际设计。该数学模型可为利用磁性颗粒的吸附装置的研制提供参考。
Recently in our research studies, ferroferric oxide magnetic micro particles were used as seeds combined with chitosan and activated carbon respectively in a nutrition recovery process for post hemodialysis (HD) and in a mixed-gas adsorbate analysis. Initially, these magnetic adsorbents used in the experiments were all sealed inside a cylinder vessel by molecular sieve filters. However, this design led to a very slow liquid or gas flow rate during adsorption. To increase the flow rate, a novel design applying a nonlinear gradient magnetic field in the reverse direction of liquid or gas flow was proposed in this paper. The objective of the design was to retain the magnetic adsorbent inside the vessel maintaining a high flow rate. The magnetic field inside an infinite solenoid coil was derived using Ampere Circuit Law and the Langevin equation. An equation, showing the relationship between the ampere-turns of the magnetic field and their positions, was outlined in this paper. We finally proved that this equation is suitable for the practical design of a magnetic field with finite length. Thus, this mathematic model could help the development of adsorption device utilizing magnetic particles.