Browsing by Author "Šulc Radek"
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- ItemCompiled visualization with IPI method for analysing of liquid-liquid mixing process(EPJ Web of Conferences, 2018) Jašíková Darina; Kotek Michal; Kysela Bohuš; Šulc Radek; Kopecký Václav
- ItemCompiled visualization with IPI method for analysing of liquid-liquid mixing process(2017) Jašíková Darina; Kotek Michal; Kysela Bohuš; Šulc Radek; Kopecký Václav
- ItemDroplets size evolution of dispersion in a stirred tank(EPJ Web of Conferences, 2018) Kysela Bohuš; Konfršt Jiří; Chára Zdeněk; Šulc Radek; Jašíková Darina
- ItemDroplets size evolution of dispersion in a stirred tank(2017) Kysela Bohuš; Konfršt Jiří; Chára Zdeněk; Šulc Radek; Jašíková Darina
- ItemEstimation of turbulence dissipation rate by Large eddy PIV method in an agitated vessel(EDP Sciences, 2015) Jašíková Darina; Kysela Bohuš; Konfršt Jiří; Šulc Radek
- ItemEvaluation of the turbulent kinetic dissipation rate in an agitated vessel(TUL Liberec, 2016) Kysela Bohuš; Konfršt Jiří; Chára Zdeněk; Šulc Radek; Jašíková Darina
- ItemEvaluation of the turbulent kinetic dissipation rate in an agitated vessel(2017) Kysela Bohuš; Konfršt Jiří; Chára Zdeněk; Jašíková Darina; Šulc RadekThe design of agitated tanks depends on operating conditions and processes for that are used for. An important parameter for the scale-up modelling is the dissipation rate of the turbulent kinetic energy. The dissipation rate is commonly assumed to be a function of the impeller power input. But this approach gives no information about distribution of the dissipation rate inside the agitated volume. In this paper the distributions of the dissipation rate inside the agitated vessels are estimated by evaluations of the CFD (Computational Fluid Dynamics). The results obtained from RANS (Reynolds Averaged Navier-Stokes equations) k-ε turbulent model and LES (Large Eddy Simulations) with Smagorinsky SGS (Sub Grid Scale) model are compared. The agitated vessels with standard geometry equipped with four baffles and stirred by either a standard Rushton turbine or a high shear impeller were investigated. The results are compared with mean dissipation rate estimated from the total impeller power input.
- ItemExperimental Study of Two-Phase Flow Using Shadowgraphy and IPI Technique(2017) Jašíková Darina; Kotek Michal; Kysela Bohuš; Šulc Radek; Kopecký Václav
- ItemLocal Turbulent Energy Dissipation Rate in an Agitated Vessel: Experimental and Turbulence Scaling(Maik Nauka/Interperiodica Publishing, 2018) Ditl Pavel; Šulc Radek; Pešava Vít; Jašíková Darina; Kotek Michal; Kysela Bohuš
- ItemLocal velocity scaling in an impeller discharge flow in T400 vessel agitated by tooth impeller in a fully turbulent region(2017) Šulc Radek; Ditl Pavel; Fořt Ivan; Jašíková Darina; Kotek Michal; Kopecký Václav; Kysela Bohuš
- ItemLocal velocity scaling in an impeller discharge flow in T400 vessel agitated by tooth impeller in a fully turbulent region(EPJ Web of Conferences, 2018) Šulc Radek; Ditl Pavel; Fořt Ivan; Jašíková Darina; Kotek Michal; Kopecký Václav; Kysela Bohuš
- ItemLocal velocity scaling in T400 vessel agitated by Rushton turbine in a fully turbulent region(TUL Liberec, 2016) Šulc Radek; Ditl Pavel; Fořt Ivan; Jašíková Darina; Kotek Michal; Kopecký Václav; Kysela Bohuš
- ItemLocal velocity scaling in T400 vessel agitated by Rushton turbine in a fully turbulent region(EPJ Web of Conferences, 2017) Šulc Radek; Ditl Pavel; Fořt Ivan; Jašíková Darina; Kotek Michal; Kopecký Václav; Kysela BohušThe hydrodynamics and flow field were measured in an agitated vessel using 2-D Time Resolved Particle Image Velocimetry (2-D TR PIV). The experiments were carried out in a fully baffled cylindrical flat bottom vessel 400 mm in inner diameter agitated by a Rushton turbine 133 mm in diameter. The velocity fields were measured in the zone in upward flow to the impeller for impeller rotation speeds from 300 rpm to 850 rpm and three liquids of different viscosities (i.e. (i) distilled water, ii) a 28% vol. aqueous solution of glycol, and iii) a 43% vol. aqueous solution of glycol), corresponding to the impeller Reynolds number in the range 50 000 < Re < 189 000. This Re range secures the fully-developed turbulent flow of agitated liquid. In accordance with the theory of mixing, the dimensionless mean and fluctuation velocities in the measured directions were found to be constant and independent of the impeller Reynolds number. On the basis of the test results the spatial distributions of dimensionless velocities were calculated. The axial turbulence intensity was found to be in the majority in the range from 0.388 to 0.540, which corresponds to the high level of turbulence intensity.
- ItemMeasurement of drop size distribution time rate for liquid-liquid dispersion using IPI method(2018) Jašíková Darina; Kotek Michal; Kysela Bohuš; Šulc Radek; Kopecký Václav
- ItemThe Minimum Recording Time for PIV Measurements in a Vessel Agitated by a High-Shear Tooth Impeller(Pleiades Publishing, 2020) Šulc Radek; Ditl Pavel; Jašíková Darina; Kotek Michal; Kopecký Václav; Kysela Bohuš
- ItemPIV Study of Flow Field in Rushton Turbine Stirred Vessel Influenced by Spatial Resolution(2017) Kotek Michal; Jašíková Darina; Kysela Bohuš; Šulc Radek; Kopecký Václav
- ItemThe minimum record time for PIV measurement in a vessel agitated by a Rushton turbine(2017) Šulc Radek; Ditl Pavel; Fořt Ivan; Jašíková Darina; Kotek Michal; Kopecký Václav; Kysela BohušIn PIV studies published in the literature focusing on the investigation of the flow field in an agitated vessel the record time is ranging from the tenths and the units of seconds. The aim of this work was to determine minimum record time for PIV measurement in a vessel agitated by a Rushton turbine that is necessary to obtain relevant results of velocity field. The velocity fields were measured in a fully baffled cylindrical flat bottom vessel 400 mm in inner diameter agitated by a Rushton turbine 133 mm in diameter using 2-D Time Resolved Particle Image Velocimetry in the impeller Reynolds number range from 50 000 to 189 000. This Re range secures the fully-developed turbulent flow of agitated liquid. Three liquids of different viscosities were used as the agitated liquid. On the basis of the analysis of the radial and axial components of the mean- and fluctuation velocities measured outside the impeller region it was found that dimensionless minimum record time is independent of impeller Reynolds number and is equalled N.tRmin = 103 ± 19.
- ItemThe minimum record time for PIV measurement in a vessel agitated by a Rushton turbine(TUL Liberec, 2016) Šulc Radek; Ditl Pavel; Fořt Ivan; Jašíková Darina; Kotek Michal; Kopecký Václav; Kysela Bohuš
- ItemVolume ratio of two immiscible phases measured by electrical impedance tomography(EDP Sciences, 2018) Malík Michal; Primas Jiří; Kotek Michal; Kysela Bohuš; Šulc Radek; Kopecký Václav