Abstract
Formation of a solid suspension in liquids is possible at a sufficiently high axial velocity of the liquid in the mixer. The formation of a slurry in the mixer is described by the minimum rotational frequency of the agitator, i.e. the lowest frequency at which the desired suspension is obtained within the mixer. Due to the hydrodynamic conditions within the mixer during the formation of a suspension with a solid phase, which is characterized by density greater than the liquid density, the agitator must possess high pumping properties towards the liquid surface. However, in the case of a solid with a density lower than the density of the liquid, its suction from the liquid surface towards the bottom and dissipation in the entire volume must be ensured. The use of excessive rotational frequency of the agitator is not economically justified because of the rapid increase of mixing power, which is disproportionate to the simultaneous mass exchange, and thus an increase in the operating costs occurs. In order to minimize these costs, an attempt was carried out to search for structural changes to the HE-3 agitator and compare them with modified HE-3X and Rushton turbine.
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Acknowledgments
This research was supported by the Ministry of Science and Higher Education in Poland subsidy for Poznan University of Technology, Faculty of Chemical Technology (Grand No.: 03/32/SBAD/0902).
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Mitkowski, P.T., Szaferski, W., Adamski, M., Adamski, R. (2020). Application of HE-3 and HE-3X Agitators in Suspension Production. In: Ochowiak, M., Woziwodzki, S., Mitkowski, P., Doligalski, M. (eds) Practical Aspects of Chemical Engineering. PAIC 2019. Springer, Cham. https://doi.org/10.1007/978-3-030-39867-5_27
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