Critical shear values of extruded polymer blends
Filip, Petr; David, Jiří; Keyzlarová, L.; Sáha, P.
2000 - English The onset of flow instabilities (encountered during extrusion of polymer melts) corresponds to the flow conditions when the critical shear stresses or the critical shear rates are attained. These critical values were experimentally determined for two cases of polymer blends. Consequently there were used the mixture rules of a logarithmic type for desciption of behaviour of critical shear values. Available in digital repository of the ASCR Critical shear values of extruded polymer blends

The onset of flow instabilities (encountered during extrusion of polymer melts) corresponds to the flow conditions when the critical shear stresses or the critical shear rates are attained. These ...

Filip, Petr; David, Jiří; Keyzlarová, L.; Sáha, P.
Ústav pro hydrodynamiku, 2000

Pumping in hydraulic capsule pipeline
Vlasák, Pavel; Berman, V.
2000 - English Capsules used in hydraulic pipeline (HCP) are solid bodies comparable in proportion with pipe diameter. Capsules cannot pass through ordinary pumps, special procedure and/or equipment has to be used for their injection and pumping. The first way is based on a bypass scheme. It's advantage is high efficiency and operational pressure. The second way is to use linear motors, the third is special jet pumps designed for HCP. Advantage of jet pumps is continuous movement of capsules and small demand on space. But only a lower efficiency and pressure increment can be reached. The jet pump may prove profitable for injection units or short HPC. The jet pump, designed for HCP are described. Available in digital repository of the ASCR Pumping in hydraulic capsule pipeline

Capsules used in hydraulic pipeline (HCP) are solid bodies comparable in proportion with pipe diameter. Capsules cannot pass through ordinary pumps, special procedure and/or equipment has to be used ...

Vlasák, Pavel; Berman, V.
Ústav pro hydrodynamiku, 2000

Lateral dispersion on solid particles in water flow
Chára, Zdeněk; Vlasák, Pavel
2000 - English The paper presents the results of investigation of solid particle motion over rough bed in an open channel flow. The turbulence characteristics of water flow were performed by means of LDA, the particle motion was analysed by a video camera. It was found that the mean deviation angle by which the particles are moving to side walls is about 2.4ř. Available in digital repository of the ASCR Lateral dispersion on solid particles in water flow

The paper presents the results of investigation of solid particle motion over rough bed in an open channel flow. The turbulence characteristics of water flow were performed by means of LDA, the ...

Chára, Zdeněk; Vlasák, Pavel
Ústav pro hydrodynamiku, 2000

Vorticity dynamics of a jet in crossflow
Kolář, Václav; Savory, E.; Toy, N.
2000 - English Vortex/vorticity dynamics of a jet in crossflow is analyzed. Both theoretically and experimentally, namely the decay rates of vortical structures closely associated with turbulent vorticity transport. Available in digital repository of the ASCR Vorticity dynamics of a jet in crossflow

Vortex/vorticity dynamics of a jet in crossflow is analyzed. Both theoretically and experimentally, namely the decay rates of vortical structures closely associated with turbulent vorticity ...

Kolář, Václav; Savory, E.; Toy, N.
Ústav pro hydrodynamiku, 2000

On turbulent characteristics of plane flows
Kolář, Václav
1999 - English Available in digital repository of the ASCR On turbulent characteristics of plane flows

Kolář, Václav
Ústav pro hydrodynamiku, 1999

Dependence of rheological parametres of fine grained slurries on concentration
Vlasák, Pavel; Chára, Zdeněk
1999 - English Available in digital repository of the ASCR Dependence of rheological parametres of fine grained slurries on concentration

Vlasák, Pavel; Chára, Zdeněk
Ústav pro hydrodynamiku, 1999

The performance of an electrorheological fluid in a stress transfer device with parallel rotating electrodes
Říha, Pavel; Kimura, H.; Vlasák, Pavel; Koyama, K.
1997 - English Available in digital repository of the ASCR The performance of an electrorheological fluid in a stress transfer device with parallel rotating electrodes

Říha, Pavel; Kimura, H.; Vlasák, Pavel; Koyama, K.
Ústav pro hydrodynamiku, 1997