Kinetic theory based particle velocity measurements in a symmetric two-story riser show that in the core the flow is laminar and that the granular temperature is approximately given by the analogue of thermal temperature rise in Poiseuille flow. However, like in the turbulent flow in a pipe, the normal kinetic stresses are anisotropic. The shear and the normal stresses are an order of magnitude...

Vortex-induced vibration (VIV) of a long riser in sheared current is often considered as an energy balance problem: Excitation forces in the power-in region add an equal amount of energy to the system as is dissipated by damping forces outside this region and structural damping. A riser may have different excitation and damping regions depending on the actual oscillation frequency, cross-sectio...

In order to reduce the shrinkage porosity of nickel-based superalloy castings in investment casting process, effects different gating systems on mold filling, solidification and prediction aero-engine turbine nozzle were investigated by simulation experimental methods. Results show that design vertical runner would cause greater turbulence melt riser during filling outer is not necessary. With ...

1 LAAS-CNRS, 7 avenue du Colonel Roche, Toulouse Cedex 4, France 2 University of York, York YO10 5DD, United Kingdom 3 PDCC CNUCE-CNR, Via S. Maria 36, 56126 Pisa, Italy 4 Intecs Sistemi S.p.A., V. L. Gereschi 32/34, 56127 Pisa, Italy 5 PDCC IEI CNR, Via S. Maria 46, 56126 Pisa Italy 6 Technicatome, BP 34000, 13791 Aix-en-Provence Cedex 3, France 7 Matra Marconi Space, 31 rue des Cosmonautes, 3...

Davide Spirito, Dominique Coquillat, Sergio L. De Bonis, Antonio Lombardo, Matteo Bruna, Andrea C. Ferrari, Vittorio Pellegrini, Alessandro Tredicucci, Wojciech Knap, and Miriam S. Vitiello NEST, Istituto Nanoscienze – CNR and Scuola Normale Superiore, Piazza San Silvestro 12, 56127 Pisa, Italy Laboratoire Charles Coulomb UMR 5221, Universit e Montpellier 2 & CNRS-, F-34095 Montpellier, France ...

limited water resources, especially in iran, require most effective method of water use to avoid losses. one of the important parameters in irrigation is water distribution uniformity coefficient (cu) in sprinkler irrigation. cu in every irrigation depends on pressure heads (p), riser height (rh), distance between sprinklers on lateral pipes (sl), and the distance between lateral pipes (sm). th...

A bioreactor refers to any manufactured or engineered device that supports a biologically active environment. These kinds of reactors are designed to treat wastewater treatment. Volumetric mass transfer coefficient and the effect of superficial gas velocity, as the most important operational factor on hydrodynamics, in three-phase airlift reactors are investigated in this study. The experiments...