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Drag reduction of dense fine-grained suspensions
Vlasák, Pavel ; Chára, Zdeněk ; Štern, Petr
The effect of addition of the sodium carbonate and soda water-glass and their concentration for different kaolin slurry was investigated. The significant decreasing of the apparent viscosity and the yield stress was observed due to the addition of the both peptising agents. The viscosity difference between coagulated and peptised slurries can achieve values of several orders of magnitudes depending on peptising agent concentrations. The modification of physico-chemical environment of the transported slurry can be used also for another fine-grained dense hydro-mixture, e.g. for different mine tailings or for bauxite residue.
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Experimental study of hemodynamic of crimped vascular grafts
Konfršt, Jiří
This experimental study deals with pulsatile flow and its development in elastic model of crimped vascular graft with spiral crimpoing. This transparent silicon rubber model allowed to measure insite the velocity field at pulsatile flow using LDA method. By a constant pulse frequency the influence of Reynolds number, Newtonian and non-Newtonian fluid on the resulting share of the velocity profile and further on its modificaton with the changing distance from model entrance was investigated.
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