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National Repository of Grey Literature 4 records found  Search took 0.00 seconds. 
Experimentální stanovení Magnusova koeficientu rotačně se pohybující kulové částice
 Lukerchenko, Nikolay ; Kharlamov, Alexander ; Kvurt, Y. ; Chára, Zdeněk ; Vlasák, Pavel
The Magnus force coefficient was determined from comparison of theoretical and experimental trajectory of rotating spherical particle falling in calm water. Theoretical trajectories of the particle were calculated using 2D numerical model of the rotating spherical particle moving in fluid and the proper value of the Magnus force coefficient was established from condition of the best fitting of the experimental trajectory by the calculated one. The mutual influence of the translational and rotational movements was described.
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Vztah viskozita vs. rychlost smykové deformace v procesu stárnutí emulsí
 Filip, Petr ; David, Jiří ; Pivokonský, Radek
The aim of this contribution is to present an empirical model taking into account ageing of highly concentrated emulsions. This model enables smooth passage from modelling of viscoelastic fluid (shear-thinning behaviour)corresponding to a "fresh" material to a description of viscoplastic fluid (viscoplastic behaviour) corresponding to an "aged" material including yield stress modelling.
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Použití metody konečných objemů pro proudění s volnou hladinou
 Hoření, Bohumír ; Chára, Zdeněk
The contribution deals with an application of discontinuous Galerkin method to free surface flow calculation. Both the super- and sub-critical flows are studied for steady and unsteady flow conditions. The numerical method is tested experimentally on flow over a broad crest weir of height to length ratio 1/8. Also VOF (volume of fluid) method is tested for the same geometrical configuration.
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Místní tlakové ztráty při proudění vody s přísadou micelárních aditiv
 Mík, Václav ; Šesták, J. ; Kořenář, Josef ; Myška, Jiří
We have studied the influence of three cationic surfactants Arquad S50, CTAB and CTAC on three different types of local pressure drops. Experiments were done on a closed hydraulic loop with the range of Reynolds numbers from 1.600 to 23.000. Four different solution concentrations were investigated. Even though all three tested additives show similar drag reduction in the straight tube, there is a substantial difference in effectiveness at local loses.
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