Abstract
The mixing process is a widespread phenomenon, which plays an essential role among a large number of industrial processes. The effectiveness of mixing depends on the state of mixed phases, temperature, viscosity and density of liquids, mutual solubility of mixed fluids, type of stirrer, and, what is the most critical property, the shape of the impeller. In the present research, the objective was to investigate the Newtonian fluids flow motion as well as all essential parameters for the mechanically agitated vessel with a new impeller type. The velocity field, the power number, and the pumping capacity values were determined using computer simulation and experimental measurements. The basis for the assessment of the intensity degree and the efficiency of mixing had to do with the analysis of the distribution of velocity vectors and the power number. An experimental and numerical study was carried out for various stirred process parameters and for fluids whose viscosity ranged from low to very high in order to determine optimal conditions for the mixing process.
Highlights
Stirred vessels are widely used in a large number of chemical and engineering processes
There is still insufficient information on the fluid behavior in unbaffled single-impeller stirred vessels which are highly important in the pharmaceutical and cosmetics industry, which require the highest standard of cleanliness, or in shear-sensitive cultures that need an appropriate gas intake [2]
To aproduce reliablea model studytothe flowthe generated by the novel the simulation resultsresults were reliabletomodel study flow generated by the impellers, novel impellers, the simulation compared with the results presented in the literature for the Rushton
Summary
Stirred vessels are widely used in a large number of chemical and engineering processes. Only a small number of numerical and experimental studies deal with laminar mixing as a promising alternative to the more destructive turbulent mixing which consumes more power [11] For this type of flow regime, energy consumption can be significantly decreased by modifying the shape of the impeller. They search for impeller type to be suitable to (cylindrical and rectangular) vessels with a flat bottom and no baffles For this reason, the present studies aimed to propose and analyze a novel impeller shape that has good efficiency and low power consumption for wide viscosity ranges. An effect of impeller design on power characteristics and mixing efficiency for the Newtonian fluids at the low Reynolds number conditions in a mechanically agitated vessel was analyzed using the computational fluid dynamic and experimental measurement
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