Fluid resistance characteristics research of nanowire rotation under a magnetic field

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• 作者：Lixin Yang (1) (2)
  Nan Zhao (1) (2)
  Li Jia (1) (2)
  
  1. Institute of Thermal Engineering ; School of Mechanical ; Electronic and Control Engineering ; Beijing Jiaotong University ; Beijing ; 100044 ; China
  2. Beijing Key Laboratory of flow and heat transfer of phase changing in micro and small scale ; Beijing ; China
  
• 关键词：Nanowire ; rotation ; simulation ; fluid torque ; wall effect
• 刊名：Journal of Thermal Science
• 出版年：2015
• 出版时间：February 2015
• 年：2015
• 卷：24
• 期：1
• 页码：73-81
• 全文大小：1,717 KB
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• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Mechanics, Fluids and Thermodynamics
  Engineering Fluid Dynamics
  Engineering Thermodynamics and Transport Phenomena
  Chinese Library of Science
  
• 出版者：Science Press, co-published with Springer-Verlag GmbH
• ISSN：1993-033X

文摘

In this study, a visualization-based experiment was performed to measure the motion of the nanowire under a magnetic field. A simulation method based on a multiple reference frame model (MRF model) was used to calculate fluid torque. Here, it was validated with the experimental data and theoretical results. Fluid torque of steady rotated nanowire was simulated and compared using experiment and theoretical models. The unsteady rotated condition was studied using transient simulation to compare with theory and the results showed that the acceleration of nanowire did not affect the flow field, indicating that the theoretical models based on the steady condition were still valid. The influence of solid walls on nanowire rotation was also studied here. The results showed that if the nanowire was placed close to the wall, the viscous force of wall would increase the velocity gradient around the nanowire, causing higher torque predictions. The fluid torque decreased quickly when the vertical distance between nanowire and wall exceeded 5 times the diameter of the wire.