The capture of fine magnetic particles from a fluid suspension in a magnetic filter element of a novel design is analyzed. Unlike the systems previously analyzed in our model the flow is bounded by a circular cylindrical surface parallel to the ferromagnetic wire, with the wire outside the cylinder thus attracting particles to the near inside surface of the pipe. This configuration is selected to eliminate wire corrosion and possibly enhance filtration efficiency. Our analysis is based on the study of particle trajectories taking into account both the laminar and the potential flow of the carrier fluid. In the case of the laminar flow, an analytical solution was obtained, allowing determination of the capture length and the capture cross-section. A comparison has been made between the capture cross-sections of both the laminar and the potential flow. This study is useful in designing magnetic filter batteries with corrosion-protected ferromagnetic wires.