Concept

Valve

Related publications (53)

Helical flows and asymmetry of blood jet in dilated ascending aorta with normally functioning bicuspid valve

Alfio Quarteroni, Christian Vergara, Elena Faggiano

Bicuspid aortic valve (BAV) is associated with aortic dilatation and aneurysm. Several studies evidenced an eccentric systolic flow in ascending aorta associated with increased wall shear stresses (WSS) and the occurrence of an helical systolic flow. This ...

Springer Heidelberg2013

Effect of drop in pipe wall stiffness on water-hammer speed and attenuation

Anton Schleiss, Fadi Hachem

The effect of local drop of wall stiffness in pressurized waterways on the pressure wave speed and the wave attenuation during transients is investigated experimentally. A new signal-processing procedure to identify the presence of a weak reach is introduc ...

2012

Comprehensive analysis of Lenz effect on the artificial heart valves during magnetic resonance imaging

Juan Ramon Mosig, Laleh Golestanirad

This work presents results of a comprehensive analysis of the Lenz effect due to motion of artificial heart valves during magnetic resonance imaging. The interaction of rotating metallic heart valves with magnetic fields is studied by performing a time-dom ...

2012

Design of Pressure Relief Valves for Protection of Steel-Lined Pressure Shafts and Tunnels Against Buckling During Emptying

Anton Schleiss, Pedro Filipe De Almeida Manso

Using high-strength steels for pressure shafts and tunnel liners and taking into account significant rock mass participation allows the design of comparatively thin steel liners in hydropower projects. Nevertheless, during emptying of waterways, these stee ...

Springer Verlag2012

Monitoring of steel-lined pressure shafts using water-hammer records and wavelet filtering and decomposition

Anton Schleiss, Fadi Hachem

The failure of steel liner of pressure shafts of hydropower plants can have catastrophic consequences. The partial or total loss of the liner support’s rigidity is characterized by a local change of the hydro-acoustic properties and creates reflection boun ...

2011

Non-Linear Stability Analysis of a Reduced Scale Model Pump-Turbine at Off-Design Operation

François Avellan, Christian Landry, Andres Müller, Sébastien Alligné, Vlad Hasmatuchi, Steven Roth

Nowadays, the pump-storage power plants are a proven solution for storing electricity at large scale and offering flexibility to the power management. Therefore, the hydraulic machines are increasingly subject to off-design operation, start-up and shutdown ...

2011

The gas flow rate increase obtained by an oscillating piezoelectric actuator on a micronozzle

Jürgen Brugger

Micronozzles with piezoelectric actuator were fabricated and investigated. The micronozzles were fabricated in glass substrates using a powderblasting technique, and the actuator is a bimorph structure made from a piezoelectric polymer. The actuator was lo ...

2008

Mass flow rate control system

Michael Amrhein

A dosage system for feeding a fluid (A) to a static mixer (1), said system comprising a tank (2) containing said fluid (A) at a predetermined pressure, a fluid passage (3) connecting said container (1) and tank (2), a control valve (4) provided within said ...

2007

Hydraulic contacts controlling water flow across porous grains

Dani Or, Marco Stampanoni

Water flow between porous grains varies widely depending on the water distribution in contacts between grains. The hydraulic behavior of contacts varies from highly conductive when water fills the contacts to a bottleneck to flow as water pressure drops an ...

2007

Fabrication process for a microfluidic valve

Cyrille Hibert, Philippe Flückiger

In this paper, the necessity for a high pressure valve is discussed, and a design for such a valve that has been previously presented is described. This valve can be built using simple fabrication techniques available in microsystem foundries. Its fabricat ...

2003

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