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Vliv gradientu rychlosti na morfologické vlastnosti aggregátů
Pivokonský, Martin ; Kysela, Bohuš ; Chára, Zdeněk
This paper summarises the preliminary results concerning an influence of the agitation conditions on the aggregation processes. The properties of formed aggregates affecting the efficiency of separation processes are studied as well. The results show that the applied velocity gradient G, the period of its action T and the distribution of velocity field in an agitated volume of water significantly influence the number of aggregates, their size and shape. Smaller and denser aggregates of a homogeneous size and more resistant to breakage are formed under a higher velocity gradient.
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Effect of ultrasound pulsations on suspension sedimentation
Suchánková, A. ; Kysela, Bohuš ; Chára, Zdeněk ; Ditl, P.
The paper presents results of a gravity settling of a model suspension. Experiments have been carried out for two configurations. The first experiment involved natural gravity settling; in the second case the ultrasound pulsations were introduced. Ultrasound field was provided by 20 kHz horn acting through a wall of settling vessel. Three kaolin suspensions of volume concentrations 3.8; 7.6; 11.4 % were used. It has been found that there is no significant influence of ultrasound pulsations on suspension settling.
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