Integrating Fluorescent Dye Flow-Curve Testing and Acoustic Doppler Velocimetry Profiling for In Situ Hydraulic Evaluation and Improvement of Clarifier Performance

2010 ◽  
Vol 82 (8) ◽  
pp. 675-685 ◽  
Author(s):  
F. Tarud ◽  
M. Aybar ◽  
G. Pizarro ◽  
R. Cienfuegos ◽  
P. Pastén
Keyword(s):  
Flow Curve ◽  
Fluorescent Dye ◽  
Doppler Velocimetry ◽  
Acoustic Doppler Velocimetry

Experimental Study of the Type VI Stilling Basin Performance

2015 ◽  
Vol 137 (3) ◽  
Author(s):  
Seyed Sobhan Aleyasin ◽  
Nima Fathi ◽  
Peter Vorobieff
Keyword(s):  
Experimental Study ◽  
Kinetic Energy ◽  
River Flow ◽  
Doppler Velocimetry ◽  
Huge Amount ◽  
Stilling Basin ◽  
Stilling Basins ◽  
Turbulence Data ◽  
Flow Turbulence ◽  
Acoustic Doppler Velocimetry

Understanding the estuarine turbulent flow from dams, channels, and pipes, as well as the river flow are very important due to the potential to cause damage to the bed of the river or channel and cause scouring of structures such as the saddles of bridges, because of the huge amount of the kinetic energy carried by the flow. One of the most efficient yet simple ways to dissipate this energy is to install a stilling basin at the discharge point to calm the flow. Turbulence data were recorded using acoustic Doppler velocimetry (ADV) for type VI2 of stilling basins for pipe outlets. During the study, various splitters and a cellular baffle were placed in the stilling basin, and the baffle locations were changed to assess the effect on the energy dissipation. Velocity at several locations in the basin was measured for different Froude numbers to investigate the effect of flow rate. Based on the findings of the experiments, several suggestions regarding the efficiency and geometry of stilling basins were made.

Inertial Deposition Effects: A Study of Aerosol Mechanics in the Trachea Using Laser Doppler Velocimetry and Fluorescent Dye

2002 ◽  
Vol 124 (6) ◽  
pp. 629-637 ◽  
Author(s):  
T. E. Corcoran ◽  
Norman Chigier
Keyword(s):  
Steady Flow ◽  
Turbulence Intensity ◽  
Axial Velocity ◽  
Laser Doppler Velocimetry ◽  
Aerosol Deposition ◽  
Fluorescent Dye ◽  
Laser Doppler ◽  
Doppler Velocimetry ◽  
Flow Rates ◽  
Phase Doppler Interferometry

This study characterizes the axial velocity and axial turbulence intensity patterns noted in the tracheal portion of a cadaver-based throat model at two different steady flow rates (18.1 and 41.1 LPM.) This characterization was performed using Phase Doppler Interferometry (Laser Doppler Velocimetry). Deposition, as assessed qualitatively using fluorescent dye, is related to the position of the laryngeal jet within the trachea. The position of the jet is dependent on the downstream conditions of the model. It is proposed therefore that lung/airway conditions may have important effects on aerosol deposition within the throat. There is no correspondence noted between regions of high axial turbulence intensity and deposition.

scholarly journals Influence of floodplain and riparian vegetation in the conveyance and structure of turbulent flow in compound channels

2018 ◽  
Vol 40 ◽  
pp. 06035 ◽  
Author(s):  
João N. Fernandes ◽  
João B. Leal ◽  
António H. Cardoso
Keyword(s):  
Turbulent Flow ◽  
Riparian Vegetation ◽  
Main Channel ◽  
Submerged Vegetation ◽  
Doppler Velocimetry ◽  
Compound Channels ◽  
Turbulence Structures ◽  
Experimental Campaign ◽  
Turbulent Flow Structure ◽  
Acoustic Doppler Velocimetry

The present study aims at understanding the changes in the channel conveyance and in the turbulent flow structure due to the presence of both submerged vegetation in the floodplains and riparian vegetation. An experimental campaign was carried out comprising uniform compound channels flows (i) without any kind of vegetation, (ii) with synthetic grass in the floodplains, (iii) with synthetic grass in the floodplains and rods in the interface between main channel and the floodplain and (iv) with synthetic grass in the floodplains and artificial shrubs in the interface between main channel and the floodplain. For comparison, the water depth in all flow cases was kept constant. Accurate acoustic Doppler velocimetry was used to evaluate the 3d velocity field and the turbulence structures characteristics.

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