The influence of the thermal expansion on the magnetic fluid sealing performance

• Published in: Journal of magnetism and magnetic materials 2022-12, Vol.564, p.169996, Article 169996
• Main Authors: Yao, Yao, Chen, Yibiao, Wei, Yijian, Ni, Chenyi, Li, Decai
• Format: Article
• Language: English
• Subjects: Magnetic fluid sealing; Rotating shaft speed; Sealing gap; Sealing performance; Thermal expansion
• ISSN: 0304-8853
• DOI: 10.1016/j.jmmm.2022.169996

•A new numerical simulation method is proposed to obtain the magnetic fluid boundary and thermal deformation of the sealing gap.•The thermal expansion displacement of magnetic materials was deduced by using the thermal resistance model.•Research on the effects of thermal expansion on magnetic fluid rotary seal. Magnetic fluid seal is the most mature application of magnetic fluid at present. However, some deficiencies limit the application of magnetic liquid seals at high rotation speeds, including the thermal expansion under different temperatures. The sealing gap width is affected by thermal expansion significantly, which leads to a change in the sealing performance. This paper proposes a new numerical simulation method to obtain the magnetic fluid boundary and the thermal deformation of the sealing gap. The dynamic mesh and thermo-hydro-mechanical coupling methods are used to calculate the thermal deformation in the two-dimensional axisymmetric model. Numerical results show the fluid temperature and sealing gap change under different rotation speeds, which influences the sealing performance.