PARTICLE IMAGE VELOCIMETRY, GAMMA DENSITOMETRY, AND PRESSURE MEASUREMENTS OF OIL-WATER FLOW

2009 ◽  
Vol 21 (1-2) ◽  
pp. 51-64 ◽  
Author(s):  
W. A. S. Kumara ◽  
B. M. Halvorsen ◽  
M. C. Melaaen
Keyword(s):  
Particle Image Velocimetry ◽  
Water Flow ◽  
Particle Image ◽  
Pressure Measurements ◽  
Image Velocimetry ◽  
Oil Water

Particle Image Velocimetry Measurements in the Wake of a Cactus-Shaped Cylinder

2011 ◽  
Vol 133 (9) ◽  
Author(s):  
Jack E. Abboud ◽  
Wafaa S. Karaki ◽  
Ghanem F. Oweis
Keyword(s):  
Particle Image Velocimetry ◽  
Particle Image ◽  
Static Pressure ◽  
Pressure Measurements ◽  
Biologically Inspired ◽  
Biologically Relevant ◽  
Image Velocimetry ◽  
Cylinder Model ◽  
The Mean ◽  
Velocity Level

The flow field past a biologically inspired cylindrical model with a cactus-shaped cross section is investigated in a wind tunnel using particle image velocimetry and surface pressure measurements at a biologically relevant Reynolds number of ∼ 2 × 105. For the cactus model, the mean streamwise flow heals faster in its immediate wake, the wake turbulent velocity level is lower, and the surface static pressure has better recovery compared to the circular cylinder model.

Particle Image Velocimetry Measurements of Wake Flows of Various Bridge Sections

2006 ◽  
Author(s):  
Emanuela Palombi ◽  
Gregory A. Kopp ◽  
Roi Gurka
Keyword(s):  
Particle Image Velocimetry ◽  
Vortex Shedding ◽  
Particle Image ◽  
Uniform Flow ◽  
Pressure Measurements ◽  
Trailing Edge ◽  
Wake Flows ◽  
Edge Geometry ◽  
Image Velocimetry ◽  
The Mean

Using Particle Image Velocimetry (PIV) we investigate the influence of leading and trailing edge geometry on the wake flows of various elongated cylinders in smooth uniform flow. The results present a comparison between the mean wake flows, as well as the vortex shedding activity found to occur in each case. Pressure measurements were recorded on the surface of the cylinders to examine the corresponding fluctuating and mean forces exhibited by each model tested. Significant variations in the wake topology and aerodynamic behaviour of the four cylinder geometries tested were observed.

Velocity and Pressure Measurements Along a Row of Confined Cylinders

2007 ◽  
Vol 129 (10) ◽  
pp. 1314-1327 ◽  
Author(s):  
Barton L. Smith ◽  
Jack J. Stepan ◽  
Donald M. McEligot
Keyword(s):  
Reynolds Number ◽  
Particle Image Velocimetry ◽  
Particle Image ◽  
Flow Behavior ◽  
Symmetry Plane ◽  
Recirculation Region ◽  
Wide Angle ◽  
Pressure Measurements ◽  
Image Velocimetry ◽  
Flow Experiments

The results of flow experiments performed in a row of confined cylinders designed to mimic a model of a prismatic gas-cooled reactor lower plenum design are presented. Pressure measurements between the cylinders were made. Additionally, the flow field was measured using particle image velocimetry at two different resolutions (one at high resolution and a second with wide angle that includes three cylinders). Based on these measurements, five regimes of flow behavior are identified that are found to depend on Reynolds number. It is found that the recirculation region behind the cylinders is shorter than that of half-cylinders placed on the wall representing the symmetry plane. Unlike a single cylinder, the separation point is always found to be on the rear of the cylinders, even at very low Reynolds number.

Wind tunnel study of separated and reattaching flows by particle image velocimetry and pressure measurements

2019 ◽  
Vol 22 (7) ◽  
pp. 1769-1782 ◽  
Author(s):  
ZR Shu ◽  
QS Li
Keyword(s):  
Reynolds Number ◽  
Particle Image Velocimetry ◽  
Turbulence Intensity ◽  
Particle Image ◽  
Leading Edge ◽  
Length Scale ◽  
Pressure Measurements ◽  
Pressure Coefficients ◽  
Image Velocimetry ◽  
The Mean

This article presents a comprehensive investigation on the separated and reattaching flows over a blunt flat plate with different leading-edge shapes by means of particle image velocimetry and surface pressure measurements. Wind tunnel tests are performed in both smooth and various turbulent flow conditions, and the separated and reattaching flows are examined as a function of Reynolds number ( Re), leading-edge shape, turbulence intensity, and turbulence integral length scale. It is shown through the particle image velocimetry and pressure measurements that the Reynolds number effect is significant regarding the mean vorticity field, but with little effect on the mean velocity field. For the effects of leading-edge shape, the distributions of pressure coefficients respond strongly to the change in leading-edge angle, and both the velocity (streamwise and vertical) and vorticity fields have a clear dependence on the leading-edge shape. For the effects of freestream turbulence, the mean pressure coefficient responds strongly to turbulence intensity, whereas the fluctuating and peak suction pressure coefficients are dependent on both turbulence intensity and integral length scale. The size of the separation bubble contracts aggressively with increasing turbulence intensity, but it remains approximately invariant in response to the change in turbulence scale in the tested range.

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