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, a what is the most critical - the shape of the impeller. In the present research, the objective is to analyse the process of the fluid flow in the mechanically agitated vessel with new impeller type. Velocity field values were determined using computer simulation and experimental particle image velocimetry method. The basis for the assessment of the intensity degree and efficiency of mixing was the analysis of velocity vectors distribution and power number. An experimental and numerical study was carried out for various stirred process parameters to determine optimal conditions for the mixing process.
Highlights
Stirred vessels are widely used in chemical processes and in bioprocess, food industry and more recently in wastewater treatment and mineral processing, to accomplish homogenization, gas dispersion, solid suspension, heat transfer, etc. [1]
As for every industrial process, the main target has ever been to find an efficient way of mixing using as low power as possible
The main target has ever been to find an efficient way of mixing using as low power as possible
Summary
Stirred vessels are widely used in chemical processes and in bioprocess, food industry and more recently in wastewater treatment and mineral processing, to accomplish homogenization, gas dispersion, solid suspension, heat transfer, etc. [1]. As for every industrial process, the main target has ever been to find an efficient way of mixing using as low power as possible. For this reason, several studies have been done to obtain different shapes of impellers that could achieve a good mixture quality with low axial velocity, low internal heat generation (important for vitamins, enzymes and in food production) and with as low as possible power consumption. The analyses reached 18% of power decrease by modifying the Rushton impeller, which managed to alter the local flow pattern and obtain more turbulence around it, eventually decreasing the mixing time required
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