Desupersaturation is a complex cooling operation that involves hydrodynamic

thermal and mechanical phenomena. This process requires continuous agitation to avoid fouling problems and sludge deposition. The current work aims to investigate the well mixedness in the desupersaturation tank for optimal performance. For this purpose

a multi-fluid CFD study was conducted based on the Euler-Euler modeling approach

considering a multiphase flow involving a liquid phase (phosphoric acid) and a poly-dispersed solid phase

i.e

. a sludge with three different sizes where each size is considered as a separate phase. First

the hydrodynamic behavior of the flow within the agitated desupersaturator is analyzed through the investigation of the velocity fields as well as the power and pumping numbers

to determine both the agitator capacity to pump the flow and its power consumption during the operation. Then

in order to assess the mixture homogeneity

we evaluated the solid suspension in the desupersaturation reactor following conventional methods and two new proposed methodologies: the first approach is to evaluate the suspension quality in the mixing system by compartment

and the second consists on the assessment of the uniform convergence of the solid concentration. Furthermore

we calculated the time required to achieve a full suspension at different solid concentrations. On other hand

we conducted a detailed analysis of the solid distribution dependency on the impeller rotational speed at different solid volume fraction

which allows a good understanding of the parameters controlling the homogenization in the desupersaturator.