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Vliv velikosti částic a smykového namáhání na tokové chování jemnozrnných suspenzí
Vlasák, Pavel ; Chára, Zdeněk ; Konfršt, Jiří
Non-Newtonian behaviour of high-concentrated sand and sand-kaolin slurries was observed. At low and medium velocities the flow resistance increases with the increasing concentration of solids, at high velocities the effect of the concentration can be opposite. An intensive turbulent and even long time laminar shearing result in a significant decreasing of the laminar/turbulent transition velocity and flow resistance in the laminar region. The effect of shearing is more significant for higher slurry concentration.
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Numerical modelling of backward-facing step flow
Chára, Zdeněk ; Hoření, Bohumír
The contribution deals with a 3D numerical simulation of backward-facing step flow. The ratio of width to height of the channel before the expansion is 10:1, the height of the step is equal to the upstream channel height (expansion ratio is 2). Both the turbulent and the laminar flow regimes are simulated. The results will be used as a basis for experimental research, which will be focused on a mutual comparison of experimental methods – mainly LDA and PIV.
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