Document Type: Full Lenght Research Article
Scientific member of Semnan University
Mixing tanks equipped with mechanical stirrer are widely used in chemical and petrochemical industries because of variety of industrial process requirements. In this study, helical single blade mixer was designed using catia software and then mixing of fluid and solid particles, in a tank with this agitator was studied by OpenFOAM software. For velocity distribution in the mixing tank, continuity, momentum equations, boundary conditions and coding were performed using C++ language scripts in the software. The results of velocity distributions in three directions coordinates were showed that the efficiency of helical blade mainly was related to axial and tangential flows. The radial flow has less important role in mixing operation. Also, solid particles concentration distribution were calculated in the fluid phase and it was shown that the particles were distributed homogeneously in the tank. In addition, temperature distribution was obtained using continuity, momentum and energy equations as well as utilizing necessary code and boundary conditions in the software. Then, a correlation for Nusselt number as a function of Re, Pr and Vi was obtained by using temperature profile and dimensional analysis. The results achieved are in good agreement with literature.