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

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

Influence of bridge entrance rounding on flow characteristics

This paper deals with the investigation of the influence of bridge entrance rounding on flow parameters as coefficient of discharge or energy losses. There have been investigated bridge models of rectangular opening with side piers (single span arrangement) and without piers (sectional model)

Shear-driven cavity flow at high Reynolds numbers

The paper deals with a research of a shear-driven cavity flow at high Reynolds numbers (Re= 12000-100000). PIV method was used with a continuous light source and at selected profiles LDA method was used, too. Numerical k-omega, SST model was used for the same range of the Reynolds numbers

Influence of bridge structures on river flow

The paper deals with an open channel flow over model of a bridge when whole discharge is going through the model opening and the upstream water level is at the same level as upper deck of the model

Measurement of the velocity field in a ribbed channel

The contribution deals with an experimental investigation of the turbulent along a ribbed channel bottom. The main goal is an application of ultrasound velocity profile technique for measurement of the turbulent flow characteristics in complex geometries. Four configurations of the ribbed surfaces were tested with fixed ribs of square cross section and variable groove widths. The experiments were performed in a water channel

Hydraulics of overflowed bridge

The paper deals with an open channel flow around model of a bridge when the water depth is higher than height of the bridge opening. Both the pressured flow through bridge opening and free surgace flow over the model were studied. For both cases discharge coefficients were determined and for overflowed model also the velocity profiles were measured to evaluate the ratio of discharges going below and over the bridge model

Influence of solids concentration on UVP measurements

The article is focused on the flow field measurement of suspension flow by UVP method and effect of concentration. Mainly are analyzed the usage limits and behavior of measurement method for higher volumetric concentration

3D measurement of particle movement using one camera

Article is focused on analysis of measuring 3D particle motion with one camera and light knife. The 3D spherical particle movement is measured using standard particle tracking method (two velocity components) combined with simple method based on light intensity of scattered light by the moving spherical particle