# Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2018 Impact factor 0.961

Nuclear Science and Techniques ›› 2018, Vol. 29 ›› Issue (6): 80

• NUCLEAR PHYSICS AND INTERDISCIPLINARY RESEARCH •

### Preliminary experimental study on applicability of Lorentz force velocimetry in an external magnetic field

Yan-Qing Tan 1,4 • Run-Cong Liu 1 • Shang-Jun Dai 1 • Xiao-Dong Wang 1 • Ming-Jiu Ni 2 • Juan-Cheng Yang 2 • Nataliia Dubovikova 3 • Yurii Kolesnikov 3 • Christian Karcher 3

1. 1 College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Huairou District, Beijing 101408, China
2 School of Engineering Science, University of Chinese Academy of Sciences, Huairou District, Beijing 101408, China
3 Institute of Thermodynamics and Fluid Mechanics, Ilmenau University of Technology, P.O.Box 100565, 98684 Ilmenau, Germany
4 The Fifth Electronics Research Institute, Ministry of Industry and Information Technology, Guangzhou 510610, China
• Contact: Xiao-Dong Wang E-mail:xiaodong.wang@ucas.ac.cn
• Supported by:

This work was supported by the National Natural Science Foundation of China (No. 51374190) and the Major Equipment Fund of Chinese Academy of Sciences (No. YZ201567).

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Yan-Qing Tan, Run-Cong Liu, Shang-Jun Dai, Xiao-Dong Wang, Ming-Jiu Ni, Juan-Cheng Yang, Nataliia Dubovikova, Yurii Kolesnikov, Christian Karcher. Preliminary experimental study on applicability of Lorentz force velocimetry in an external magnetic field.Nuclear Science and Techniques, 2018, 29(6): 80

Abstract:

Lorentz force velocimetry (LFV) is a noncontact technique for measuring electrically conducting fluids based on the principle of electromagnetic induction. This work aims to answer the open and essential question of whether LFV can work properly under a surrounding external magnetic field (ExMF). Two types of ExMFs with different magnetic intensities were examined: a magnetic field with a typical order of 0.4 T generated by a permanent magnet (PM) and another generated by an electromagnet (EM) on the order of 2 T. Two forces, including the magnetostatic force between the ExMF and PM in the LFV, and the Lorentz force generated by the PM in LFV were measured and analyzed in the experiment. In addition, ExMFs of varying strengths were added to the LFV, and the location of the LFV device in the iron cores of the EM was considered. The experimental outcomes demonstrate that it is possible for a LFV device to operate normally under a moderate ExMF. However, the magnetostatic force will account for a high proportion of the measured force, thus inhibiting the normal LFV operation, if the ExMF is too high.