Abstract
Magnetic fluids are an artificial material that is characterized by fluidity and the ability to be strongly magnetized in magnetic fields. They consist of colloidal particles of a ferri- or ferromagnet, a carrier liquid medium and a surfactant. (Research purpose) The research purpose is determining the parameters of magnetic fluids for the developed electric pulsator. We chose a magnetofluidic seal for the sealing unit in the new design of the electric pulsator of the milking machine; the magnetofluidic seal assembly holds the rod of the linear electric motor in a strictly axial position, excluding distortions, locking and vibration, which ensures stable performance of the specified milking mode. (Materials and methods) It was shown that the developed magnetofluidic sealing unit is located in a groove filled with magnetic fluid. It was determined that the leakage of magnetic fluid in the groove excludes a toroidal permanent magnet limited by a retainer. A suspension of highly dispersed magnetite particles in kerosene stabilized with oleic acid was used in the developed magnetofluidic compaction unit. (Results and discussion) Experimental dependences of magnetization on the magnitude of the applied magnetic field, as well as the coefficient of thermal conductivity on temperature, were obtained for three samples of magnetic fluid with different concentrations of the solid phase. It was found that all samples have a linear dependence of magnetization up to the values of the external magnetic field strength of about 35 kiloamps per meter. It was found that the saturation magnetization of the magnetic fluid increases from 21 to 24 kiloamps per meter with an increase in the concentration of the magnetic phase from 8 to 12 percent in the samples. It was established during the calculation that the pressure drop that the developed unit withstands is from 104 to 106 pascal. It was theoretically proved that the critical pressure drop increases with a decrease in the gap between the rod and the retainer. (Conclusions) Three samples of magnetic fluid were studied and hydrodynamic, thermophysical and other parameters of magnetic fluids potentially applicable for their use as seals in the nodes of the magnetofluidic seal of the developed electric pulsator were determined.
Published Version
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