Jerzy Kamieński
Technical Transactions, Volume 5 Year 2017 (114), 2017, pp. 129-139
https://doi.org/10.4467/2353737XCT.17.076.6433Critical impeller rotational speeds for having a solid suspension in a liquid and for gas dispersion in the slim vessel with two independently driven impellers were determined. An A-315 impeller functioned as the lower impeller whereas a Rushton turbine was fixed higher with gas being fed right below the latter. We investigated what influence on this rotational speed was had by the distance between the impellers, their rotational direction, solid concentration, solid particle size and gas flow rate. Results obtained for the twoand three-phase systems were compared. In the three-phase systems, we also measured the power input in order to assess the efficiency of mixing.
Jerzy Kamieński
Technical Transactions, Mechanics Issue 2-M (3) 2016, 2016, pp. 81-96
https://doi.org/10.4467/2353737XCT.16.096.5495The aim of the article was the analysis of liquid flow of radial-axial circulation in the mixing vessel equipped with a dual impeller set, of which the lower impeller induces radial-axial liquid stream, while the upper is turbine disc impeller with vertical blades, ejecting the liquid radially. On the basis of measurements of the liquid instantaneous velocity, the circulation flow rate was evaluated and supplemented with the exchange flow rate – occurring between adjacent compartments. The usage of a CMA model allows to describe the cycle of liquid transport.