To investigate the effect of the rheological and geometrical parameters on the mixing quality in a laminar pressure flow, the dispersive and the distributive mixing are studied in a converging pipe. For, this purpose the mean strain function and Manas-Zloczower mixing index are calculated using an in-house finite element code to explain the effect of the rheological and geometrical parameters on the distributive and dispersive mixing, respectively. Keywords: Particle tracking, Finite element, residence time, dispersive mixing, distributive mixing