Fluid Dynamic Characterization of Transcatheter Aortic Valves Using Particle Image Velocimetry

2018 ◽  
Vol 42 (11) ◽  
pp. E357-E368 ◽  
Author(s):  
Mohammed Barakat ◽  
Danny Dvir ◽  
Ali N. Azadani
Keyword(s):  
Particle Image Velocimetry ◽  
Particle Image ◽  
Fluid Dynamic ◽  
Dynamic Characterization ◽  
Aortic Valves ◽  
Image Velocimetry

Natural Convection Around a Horizontal Heated Square-Section Cylinder in an Enclosure: Visualization and Dynamic Characterization of Instabilities by Particle Image Velocimetry

2008 ◽  
Author(s):  
Gillian Leplat ◽  
Philippe Barricau ◽  
Philippe Reulet ◽  
Pierre Millan
Keyword(s):  
Particle Image Velocimetry ◽  
Particle Image ◽  
Three Dimensional ◽  
Dynamic Characterization ◽  
Steady Regime ◽  
Time Resolved ◽  
Unsteady Regime ◽  
Image Velocimetry ◽  
Side Walls

Consider an air-filled square cavity with cold top and bottom walls, adiabatic side walls and a centered heated sharp-edged source (a square-section cylinder). An unstable behavior has been highlighted previously while studying the effects of confinement (with different cylinder sizes) on the topology of the flow. A transition occurs from a bi-dimensional, steady regime to a three-dimensional, unsteady regime when the aspect ratio reaches the value of 0.4 for a Rayleigh number of 5.74 × 104. Time-resolved 2D particle image velocimetry is used to characterize the dynamics of the flow in this configuration. The evolution of the instability is particularly investigated.

Flow characterization of diffusion flame oscillations using particle image velocimetry

2008 ◽  
Vol 46 (4) ◽  
pp. 737-746 ◽  
Author(s):  
Nadir Yilmaz ◽  
Ralph E. Lucero ◽  
A. Burl Donaldson ◽  
Walt Gill
Keyword(s):  
Particle Image Velocimetry ◽  
Diffusion Flame ◽  
Particle Image ◽  
Flow Characterization ◽  
Image Velocimetry

An Experimental Study on the Performance of Drag-Reducing Polymers in Single- and Multiphase Horizontal Flow Using Particle Image Velocimetry

2018 ◽  
Vol 140 (5) ◽  
Author(s):  
Ihab H. Alsurakji ◽  
A. Al-Sarkhi ◽  
M. Habib ◽  
Hassan M. Badr
Keyword(s):  
Particle Image Velocimetry ◽  
Particle Image ◽  
Pipe Wall ◽  
Fluid Dynamic ◽  
Water Soluble ◽  
Experimental Investigations ◽  
Two Phase ◽  
Image Velocimetry ◽  
Flow Field Characteristics ◽  
Phase Water

This paper presents experimental investigations conducted to understand the influence of water-soluble drag-reducing polymers (DRPs) in single- and two-phase (stratified wavy) flow on flow-field characteristics. These experiments have been presented for water and air–water flowing in a horizontal polyvinyl chloride 22.5-mm ID, 8.33-m long pipe. The effects of liquid flow rates and DRP concentrations on streamlines and the instantaneous velocity were investigated by using particle image velocimetry (PIV) technique. A comparison of the PIV results was performed by comparing them with the computational results obtained by fluent software. One of the comparisons has been done between the PIV results, where a turbulent flow with DRP was examined, and the laminar–computational fluid dynamic (CFD) prediction. An agreement was found in the region near the pipe wall in some cases. The results showed the powerfulness of using the PIV techniques in understanding the mechanism of DRP in single- and two-phase flow especially at the regions near the pipe wall and near the phases interface. The results of this study indicate that an increase in DRP concentrations results in an increase in drag reduction up to 45% in single-phase water flow and up to 42% in air–water stratified flow.

Sign in / Sign up

Export Citation Format

Share Document