| dc.description.abstract | In this study, aggregation of magnetic particles is affected by the interaction of external magnetic field and flow rate. We analyze the result of aggregation with different direction of external magnetic field, respectively. The circumstances of aggregation are investigated via microscopic visualization system and digital image analysis. Finally, the regression of aggregation is made by dimensionless parameter. In the result, the rate of aggregation are increasing by enhancing the external magnetic field in all cases. But in different flow rate, the circumstances of aggregation are changed by the value of dimensionless parameter ,Cm-s. When Cm-s is greater than 1, the rate of aggregation are increasing by increasing the flow rate. On the contrary, the aggregations are broken by the shear force when Cm-s smaller than 1. In the result of fractal dimension, enhancing the external magnetic field will obtain larger fractal dimension. The flow rate cause no effect to fractal dimension. The regression analysis is made by rate of aggregation, V and dimensionless parameter, Cm-s. The result of regression is V=－0.096318＋0.326564×√Cm-s We can use this model to predict the rate of aggregation. | en_US |