OPTIMIZATION OF FLUID DYNAMICS BY SHEAR THINNING IN STIRRED TANKS USING ANCHOR STIRRERS WITH CONVERGENT HOLLOWS

Agitator shapes are of paramount importance in mixing processes, prompting researchers to explore new configurations to improve these operations. Our study focuses on the three-dimensional fluid dynamics in a flat-bottomed cylindrical tank equipped with different anchor shapes, ranging from the standard configuration to modified variants. Using both Newtonian and non-Newtonian fluids under laminar conditions, we aim to assess the impact of these variations on agitation performance. To analyze these data, we have defined ranges of parameters, including hydrodynamic parameters such as Reynolds number, covering a range from 1 to 100, as well as the rheological behavior index, varying from 0.6 to 1.4. In addition, we are exploring the influence of the number of convergent hollows. The new agitators equipped with convergent hollows have generated axial and radial velocities approaching the tangential velocity, thereby promoting a more uniform distribution of fluids in the tank. This configuration thus facilitates a more homogeneous and efficient mixing. Additionally, energy consumption remains practically constant, offering advantages in terms of efficiency.