CAPTURE MODELING FOR AN AXIAL HIGH-GRADIENT MAGNETIC SEPARATION FILTER WITH A BOUNDED FLOW-FIELD

The capture of fine magnetic particles from a fluid suspension in a ma gnetic filter element of a novel design is analyzed. Unlike the system s previously analyzed in our model the flow is bounded by a circular c ylindrical surface parallel to the ferromagnetic wire, with the wire o utside the cylinder thus attracting particles to the near inside surfa ce of the pipe. This configuration is selected to eliminate wire corro sion and possibly enhance filtration efficiency. Our analysis is based on the study of particle trajectories taking into account both the la minar and the potential flow of the carrier fluid. In the case of the laminar flow, an analytical solution was obtained, allowing determinat ion of the capture length and the capture cross-section. A comparison has been made between the capture cross-sections of both the laminar a nd the potential flow. This study is useful in designing magnetic filt er batteries with corrosion-protected ferromagnetic wires.