CFD Simulation of the Discharge Flow from Standard Rushton Impeller

The radial discharge jet from the standard Rushton turbine was investigated by the CFD calculations and compared with results from the Laser Doppler Anemometry (LDA) measurements. The Large Eddy Simulation (LES) approach was employed with Sliding Mesh (SM) model of the impeller motion. The obtained velocity profiles of the mean ensemble-averaged velocity and r.m.s. values of the fluctuating velocity were compared in several distances from the impeller blades. The calculated values of mean ensemble-averaged velocities are rather in good agreement with the measured ones as well as the derived power number from calculations. However, the values of fluctuating velocities are obviously lower from LES calculations than from LDA measurements

CFD simulation of turbulent velocity field in the discharge streem from a standard Rushton turbine impeller

The velocity field around the standard Rushton turbine was investigated by the Computational Fluid Dynamics (CFD) calculations and compared with results obtained from the Laser Doppler Anemometry (LDA) measured in a pilot plant baffled cylindrical vessel. For calculations the Large Eddy Simulation (LES) approach was employed. The impeller motion was modeled using the Sliding Mesh technique (SM). The mean ensemble-averaged velocity profiles and root mean square values of fluctuations were compared in the radial discharge jet from the standard Rushton turbine under turbulent regime of flow of agitated liquid. There were found two subregions in the discharge stream and the values of the axial profiles of the radial component of the fluctuating velocity are rather same determined from the LES calculations and from the LDA measurements in the second one ZEF (zone of established flow) of the impeller discharge stream, but they differ in the first region ZFE (zone of flow establishment) in the impeller vicinity, although they exhibit the same shape. The impeller power number derived from calculations shows also good agreement with values introduced in literature with a significant influence of the thickness of the impeller disc

Settling Slurry Transport: Effects of Solids Grading and Pipe Inclination

In many industrial applications, settling slurries composed of coarse solid particles (typically sand or gravel) and Newtonian-carrying fluid (typically water) are transported in pipelines. Turbulent flow of such slurries consumes significantly more energy than flow of the carrying fluid alone. A contribution of transported solids to the energy loss is sensitive to solids grading and to the related distribution of solids in a pipe. Also related to the solid’s distribution are changes in energy losses caused by an inclination of a pipe transporting settling slurry. We report on recent advances in the description and modeling of pipe flows of settling slurries with a special focus on the effects that the solids grading and the flow inclination have on flow friction. The description includes results of laboratory experiments and model predictions

The assessment of the water pipelines net conditions at Vyškov brewery, with the focusing on pasteurizer water supply, air penetration and beer aeration.

The Technical report deals with the pasteurizer water supply air intrusion at the Vyškov brewery. Assessment of pipeline system installation condition has been done, pressure loss has been calculated, the pressure in the suction part of pasteurizer pump has been specified. Brewery water pipeline operational conditions has been analysed with the goal to find the cause why the air gets sucked in to water pipeline nets

Fine set-up of the Ar-Ion laser and fibre loader

Use of lasers in the measuring systems, which use LDA/PDA devices, expects good knowledge of physical characteristics of used light source namely for multicomponent measurements. This article is focused on the experimental parameter analysis of individually separated light wavelength from Ar-Ion plasma tube, working in multiline “ML” mode. The best laser source parameters: aperture size, power input and quality of the utilized separate wavelengths were obtained and beams were adjusted to the optical fibres

Experimental study of hemodynamic of crimped vascular grafts

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