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Present physical models describe the effects of magnetic field-dependent viscosity on unsteady water-based Fe 3 O 4  magnetic fluid flow over a rotating and vertical moving disk. The first model represents the effect of magnetic field-dependent viscosity in the presence of a stationary magnetic field and the second model demonstrates the presence of an alternating magnetic field. However, the previous investigation of water conveying iron(iii)oxide nanoparticles flow in a rotating system is not available on the comparison of spatially variable magnetic field and alternating magnetic field on the velocity distribution in the presence of rotating and vertical moving disk. The variations in the viscosity due to the alternating magnetic field depend not only on the strength of the magnetic field but also on the frequency of the alternating magnetic field. This study might have a significant role in the improvement of the sealing of rotating shaft and study of magnetic field dependent viscosity of water conveying iron(iii)oxide nanoparticles are important for hyperthermia in the treatment of cancer disease. An alternating magnetic field generates higher friction on the disk as compared to the stationary magnetic field.

Analysis of water conveying iron(iii)oxide nanoparticles subject to a stationary magnetic field and alternating magnetic field