Magnetic particles have many applications such as drug delivery, biomedical imaging and waste water treatment. For designing the best system for these applications it is important to know the key parameters and how these parameters affect on the system. Particle diameter, magnetic field strength and the flow velocity are some of these parameters. In this study, we studied the influence of these parameters. It was found out that absorption rate of magnetic particles increases by increasing the coil current and particle diameter and by decreasing the Reynolds number.