Investigation of the effect of geometrical features of carotid artery plaque on turbulence intensity using Doppler ultrasound and particle image velocimetry

2012 ◽  
Author(s):  
Sarah Kefayati ◽  
Janet L. Powell ◽  
Emily Y. Wong ◽  
Tamie L. Poepping
Keyword(s):  
Particle Image Velocimetry ◽  
Carotid Artery ◽  
Doppler Ultrasound ◽  
Turbulence Intensity ◽  
Particle Image ◽  
Carotid Artery Plaque ◽  
Image Velocimetry ◽  
Geometrical Features

Validation of Doppler ultrasound measurements using particle, image velocimetry in a flow phantom

2004 ◽  
Vol 115 (5) ◽  
pp. 2524-2524
Author(s):  
John Cosgrove ◽  
Siobhan Meagher ◽  
Peter Hoskins ◽  
Clive Greated ◽  
Richard Black
Keyword(s):  
Particle Image Velocimetry ◽  
Doppler Ultrasound ◽  
Particle Image ◽  
Image Velocimetry ◽  
Flow Phantom ◽  
Ultrasound Measurements

Aerothermal Characterization of a Rotating Ribbed Channel at Engine Representative Conditions—Part I: High-Resolution Particle Image Velocimetry Measurements

2016 ◽  
Vol 138 (10) ◽  
Author(s):  
Ignacio Mayo ◽  
Gian Luca Gori ◽  
Aude Lahalle ◽  
Tony Arts
Keyword(s):  
Reynolds Number ◽  
Particle Image Velocimetry ◽  
Cross Section ◽  
Turbulence Intensity ◽  
Particle Image ◽  
Channel Cross Section ◽  
Recirculation Bubble ◽  
Rotation Numbers ◽  
Image Velocimetry ◽  
Static Conditions

The present work is part of a detailed aerothermal investigation in a model of a rotating internal cooling channel performed in a novel facility setup which allows test conditions at high rotation numbers (Ro). The test section is mounted on a rotating frame with all the required instrumentation, resulting in a high spatial resolution and accuracy. The channel has a cross section with an aspect ratio of 0.9 and a ribbed wall with eight ribs perpendicular to the main flow direction. The blockage of the ribs is 10% of the channel cross section, whereas the rib pitch-to-height ratio is 10. In this first part of the paper, the flow over the wall region between the sixth and seventh ribs in the symmetry plane is investigated by means of two-dimensional particle image velocimetry (PIV). Tests were carried out at a Reynolds number (Re) of 15,000 in static and rotating conditions, with a maximum Ro of 0.77. Results are in good agreement with the data present in literature at the same Reynolds number and with rotation numbers of 0 (static conditions) and 0.38 in a channel with the same geometry as in the present work. When Ro is increased from 0.38 to 0.77, the main velocity and turbulence fields show important changes. At a rotation number of 0.77, although the extension of the recirculation bubble after the sixth rib on the trailing side does not vary significantly, it covers the full inter-rib area on the leading side in the streamwise direction. The turbulence intensity on the leading side shows a low value with respect to the static case but roughly at the same level as in the lower Ro case. On the trailing side, the maximum value of the turbulence intensity slightly decreases from Ro  = 0.38 to Ro  = 0.77, the wall shear layer is restabilized along the second half of the pitch due to the high rotation, and the secondary flows are redistributed causing spanwise vortex compression. The observed result is the rapid decay of turbulent fluctuations in the second half of the inter-rib area.

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