1,721,315 research outputs found
Caratteristiche del moto intorno ad un cilindro rettangolare soggetto ad un flusso asimmetrico
No full textValvola di regolazione a recupero di energia
No full textIl brevetto riguarda l'inserimento di una turbina all’interno di una valvola a sfera al fine di recuperare parte dell'energia dissipata durante la regolazione
Fluid-dynamic loading on a tilted rectangular cylinder near a solid wall
No full textWe investigate the impact of different boundary conditions on the flow field developing around a tilted rectangular cylinder. We are mainly interested in analyzing the changes in force coefficients and in the vortex shedding Strouhal number due to the proximity of the cylinder to a bottom plate (placed at various distances from the cylinder) at different angles of attack. The angle of attack ranges between -30° and +30° and the cylinder elevation above the bottom wall is varied between almost zero and 200 mm. The effects of the different boundary conditions on the vortex shedding phenomenon are investigated by considering the Strouhal number of the vortex shedding as the key controlling parameter. The experimental results mimicking the unbounded conditions (relative large elevation of the cylinder above the solid wall) are in close agreement with those already found in literature. On the contrary, remarkable differences occur when the elevation of the cylinder is decreased. A large body of experimental results is related to the small elevation conditions at different attack angles, where the presence of the wall has a non-negligible effect on the behavior of the force coefficients and Strouhal number of the vortex shedding. Copyright © 2006 by ASME
Filogenesi della comunicazione acustica nei vertebrati: un approccio comparativo per la biologia della musica
No full textDal treno di impulsi al tono puro: storia naturale della comunicazione sonora in un gruppo di pesci ossei
No full textWall effects on the flow structure around a rectangular cylinder
No full textThe mean flow structure around an elongated rectangular cylinder near a solid wall was quantitatively characterized. The flow fields were experimentally measured by means of a 2D PIV technique.
The flow pattern was extracted for each experimental
condition and the effect of the solid wall was investigated by varying the distance of the cylinder from
the wall. We used a detection algorithm able to extract a series of significant points on 2D velocity fields.
The cataloguing of these points made it possible to
trace, in the measurement plane, a series of characteristic lines depicting the architectural state of flow.
Finally, the parametric description of the morphological state of flow allowed quantification of the effects of
the boundary (wall proximity) conditions on the flow
structure. The parameterization of the flow structure
enabled the identification of significant kinematic parameters, which were compared with the force coeffi-
cients on the obstacle
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