Sealing Liquid Isolated by Compressed-Gas with Magnetic Fluid:A Methodological Study

We addressed the sealing of the liquid,isolated by compressed-air at an interfacial gap,with magnetic fluid.The original work was the design optimization of isolation gap(hollow-cylinder),effectively confining compressed gas and isolating water from magnetic fluid.First,the impact of the magnetic field on the critical pressure of compressed gas was theoretically analyzed; second,the magnetic field distribution at the optimized gap was simulated with ANSYS software; and finally,the prototyped sealing structure,based on the optimized magnetic field and gas pressure,was evaluated with the lab-built test platform.The results show that the critical pressure of newly-developed water/compressed-gas/magnetic-fluid sealing outperformed that of the water/magnetic-fluid sealing,because the critical pressure was almost equal to that of gas/magnetic-fluid.We suggest that the compressed gas isolation be of some technological interest in sealing of gases with magnetic fluid.