Particle image velocimetry study of turbulent flow over transverse square ribs in an asymmetric diffuser

2007 ◽  
Vol 19 (6) ◽  
pp. 065106 ◽  
Author(s):  
Mark F. Tachie
Keyword(s):  
Particle Image Velocimetry ◽  
Turbulent Flow ◽  
Particle Image ◽  
Image Velocimetry ◽  
Particle Image Velocimetry Study

Particle Image Velocimetry Study of Flow near Trashrack Models

2009 ◽  
Vol 135 (8) ◽  
pp. 671-684 ◽  
Author(s):  
Jonathan M. Tsikata ◽  
Mark F. Tachie ◽  
Chris Katopodis
Keyword(s):  
Particle Image Velocimetry ◽  
Particle Image ◽  
Image Velocimetry ◽  
Particle Image Velocimetry Study

Particle Image Velocimetry Study of the Turbulence Characteristics in an Aerated Flotation Cell

2017 ◽  
Vol 56 (46) ◽  
pp. 13919-13928 ◽  
Author(s):  
Hossna Darabi ◽  
S. M. Javad Koleini ◽  
David Deglon ◽  
Bahram Rezai ◽  
Mahmoud Abdollahy
Keyword(s):  
Particle Image Velocimetry ◽  
Particle Image ◽  
Turbulence Characteristics ◽  
Image Velocimetry ◽  
Flotation Cell ◽  
Particle Image Velocimetry Study

An Experimental Investigation of Turbulent Drag Reduction in Concentric Annulus Using Particle Image Velocimetry Technique

2013 ◽  
Author(s):  
Fabio Ernesto Rodriguez Corredor ◽  
Majid Bizhani ◽  
Ergun Kuru
Keyword(s):  
Particle Image Velocimetry ◽  
Turbulent Flow ◽  
Drag Reduction ◽  
Particle Image ◽  
Reynolds Shear Stress ◽  
Polymer Concentration ◽  
Mean Flow ◽  
Flow Loop ◽  
Mean Velocity ◽  
Image Velocimetry

Polymer drag reduction is investigated using the Particle Image Velocimetry (PIV) technique in fully developed turbulent flow through a horizontal flow loop with concentric annular geometry (inner to outer pipe radius ratio = 0.4). The polymer used was a commercially available partially hydrolyzed polyacrylamide (PHPA). The polymer concentration was varied from 0.07 to 0.12% V/V. The drag reduction is enhanced by increasing polymer concentration until the concentration reaches an optimum value. After that, the drag reduction is decreased with the increasing polymer concentration. Optimum concentration value of PHPA was found to be around 0.1% V/V. Experiments were conducted at solvent Reynolds numbers of 38700, 46700 and 56400. The percent drag reduction was found to be increasing with the increasing Reynolds number. The study was also focused on analyzing the mean flow and turbulence statistics for fully-turbulent flow using the velocity measurements acquired by PIV. Axial mean velocity profile was found to be following the universal wall law close to the wall (i.e., y+ <10), but it deviated from log law results with an increased slope in the logarithmic zone (i.e., y+ >30). In all cases of polymer application, the viscous sublayer (i.e., y+ <10) thickness was found to be higher than that of the water flow. Reynolds shear stress in the core flow region was found to be decreasing with the increase in polymer concentration.

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