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A theoretical review of the particle buildup processes involved in dielectrophoretic capture of dielectric and conducting particles is presented. Trajectories are calculated, and the capture radius is plotted against the electric field and flow parameters. Photographic data of capture of barium titanate particulates are shown for the axial case, using a fine steel rod in laminar flow. A correlation for the radius of accumulation at saturation is obtained between the theoretical model and the experimental results.