An experimental investigation on the fluid flow mixing process in agitated vessel

¹ AGH University of Science and Technology, Faculty of Energy and Fuels A.Mickiewicza 30, 30-059 Kraków, Poland
² University of Cagliari, Department of Ingegneria Civile, Ambientale e Architettura, Via Marengo 2, 09123 Cagliari, Italy

^* Corresponding author: jaszczur@agh.edu.pl

Published online: 24 October 2022

Abstract

The fluid mixing process is a common supportive phenomenon that often occurs in a large number of industrial systems. This phenomenon is the subject of many numerical and experimental analysis. The mixing process effectiveness depends on: mixing tank construction, mixing phases viscosity, temperature, density of liquids and, what is crucial, the impeller shape. The optimal design of impeller geometry is still an open issue. In this research work, the main objective is experimental investigations of the influence of the newly constructed impeller type on the fluid flow motion phenomena and energy consumption. Flow field values were evaluated using PIV measurement and the power consumption using precise torquemeter. The comparison between the Rushton turbine and a novel impeller is presented and discussed. The basis for the assessment of the intensity degree and efficiency of mixing was the analysis of velocity vectors distribution and power number. Results show that the power number for both impellers are similar but the fluid motion is quite different. The pumping capacity Q_z for the novel impeller in reference to the Rushton turbine is for many cases at least one order of magnitude higher. This shows that the proposed impeller can be a very promising alternative to the classic blades and non-blades based impeller types.