We study the influence on steady turbulent states of the forcing in a von Karman flow, at constant impeller speed, or at constant torque. We find that the different forcing conditions change the nature of the stability of the steady states and reveal dynamical regimes that bear similarities to low-dimensional systems. We suggest that this forcing dependence may be applicable to other turbulent ...

Crossflow turbines represent a valuable choice for energy recovery in aqueducts, due to their constructive simplicity and good efficiency under variable head jump conditions. Several experimental numerical studies concerning the optimal design of crossflow hydraulic have already been proposed, but all them assume that structural safety is fully compatible with sought after geometry. We show fir...

The issues of numerical modeling hydrodynamic resistance the impeller for mixing slurry mixtures in production cement compositions are considered. Mathematical models based on finite element method to analyze processes occurring cement-containing developed. influence rotor design value torque power shaft has been investigated. It is established that most acceptable option a vane creates good tu...

Centrifugal pumps are widely used in the oil and mining industries. In contrast to water pumps, centrifugal industries for transportation of drilling fluid, which is typically non-Newtonian fluid. Drilling fluids usually modeled as power-law with varying shear viscosity imposed rates. this paper, a numerical simulation fluid flow pump was simulated, only flow-rate magnitude, using comparison. T...

Mixing patterns in agitated vessels equipped with various types of helical ribbon impellers are observed by using capsules of liquid crystal as a tracer. As a result, the optimumgeometrical variables for the mixing process are provided and the results explained by considering the relation between the mixing pattern and impeller geometry. A mathematical model is developed and applied in order to...

The inducer is a very small booster pump, lifting the suction pressure to a sufficient level for the main conventional impeller. By adding the inducer to high speed centrifugal pumps, NPSHr can be reduced to a great extent. Liquid with high gas content can be pumped successfully with inducer equipped pumps. Even low NPSHr allows a smaller, higher speed low horsepower pump, saving energy and cap...

We present preliminary results from numerical simulations of blood flow in a prototype of a centrifugal pump. The simulations involve incompressible Navier-Stokes governing equations, stabilized space-time finite element formulations, and parallel implementation on distributed memory architectures. The examples illustrate our approach of custom hybrid structured-unstructured tetrahedral meshes,...

Unsteady forces generated by fluid flow through the impeller shroud leakage path of a centrifugal pump were investigated. The effect of leakage path inlet swirl (pump discharge swirl) on the rotordynamic forces was re-examined. It was observed that increasing the inlet swirl is destabilizing both for normal and tangential rotordynamic forces. Attempts to reduce the swirl within the leakage path...

Adiei GlIinzburg is a Research Scientisl at the l nsfifll l de Machines Hydrau /iques et de Mecaniqlle des Fluides at the EcoLe Polytechn ique Federate de Lausallne, Switzerland. She IIo/eisa B.Sc. degree in AeronaMical Engineeringfrom the University a/the Witwatersrand and M.S. and Ph.D. degrees from the CaLifornia Institute a/ Technology. Christopher E. Brennen is a Professor of Mechanical En...