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Investigations of liquid flow velocity in a vibromixer using stereo PIV anemometry

100%
Wójtowicz R., Paszkowska S.
Czasopismo Techniczne
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PL
This paper presents the results of investigations of liquid flow in a vibromixer with a single, reciprocating disc. Measurements were conducted using Particle Image Velocimetry (Stereo PIV). Liquid circulation was analysed for two cases: in a whole mixing vessel; in selected zones of intensive flow, e.g. in a gap between the disc and the tank wall. Results of measurements are presented as vector and contour maps of flow velocity distribution. Also, curves illustrating changes of flow for various instantaneous disc positions are shown. Results presented in this work can be used in practice during designing and design optimization of vibromixers applied in the production of multiphase systems and also for the creation of theoretical foundations for the dispersing of phases using mixing equipment of this kind.
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The computational-fluid-dynamics study of an unbaffled stirred vessel with eccentrically positioned impeller

100%
Wójtowicz R., Lipin A. A.
Czasopismo Techniczne
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PL
The paper presents the results of CFD simulations of liquid flow in an unbaffled stirred vessel with an eccentrically positioned impeller. The influence of the impeller’s distance from the tank axis (eccentricity) on the generated flow circulation was analyzed. Based on numerical modelling, the flow pattern, vortex formation as well as turbulence parameters in selected stirred vessel zones were determined. Obtained results were presented as vector/contour maps, and iso-surfaces of Q-criterion for identification of vortex cores. Additionally, for each investigated stirred vessel power consumption was calculated.
3
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Performance of a cyclone with an aslant shaped inlet

100%
Wójtowicz R., Wolak P.
Czasopismo Techniczne
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PL
This paper presents an analysis of selected operating parameters of a cyclone with a modified inlet. The modification consisted in an angular arrangement of an inlet channel wall. This can result – in view of previously conducted experiments – in a faster insertion of a dusty gas into a swirl motion, an improvement of particles separation process. The analysis was carried out using numeric CFD simulations. The results were compared to those obtained from simulations and lab-measurements for a cyclone with standard inlet.
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Modeling the combined polymerization and drying of polyacrylamide prepolymer

81%
Lipin A. A., Lipin A. G., Wójtowicz R.
Czasopismo Techniczne
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PL
In the paper, the mathematical model of combined polymerisation and drying of polyacrylamide prepolymer is presented. It allows to predict the change of monomer conversion degree, polymer moisture content, the temperatures of gas and polymer in the dryer as well as dryer sizes. Using a developed model, values of technological parameters were established, providing faster polymerisation than in the case of drying.
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