The sealing pressure variance originated from volume of ferrofluids in magnetic fluid seal

To find the relationship between the volume of ferrofluids injected into the sealing gap and the sealing pressure of magnetic fluid seal, a magnetic fluid sealing experimental equipment is well designed. The ferrofluids used in magnetic fluid seal experiments are expertly synthesized silicone oil based ferrofluids, which have a saturated magnetization as high as 31.4 kA/m. The finding of experiments and simulation results indicates that the sealing pressure has a positive relationship with the volume of ferrofluids when the volume is smaller than 0.5 mL. Based on those results, a theoretical model is established. The key factor affecting the sealing pressure is the thickness of liquid sealing barrier L, which is related to the volume of ferrofluids.