In vitro velocity measurements in the near vicinity of the Bjork-Shiley aortic prosthesis using a laser-Doppler anemometer

1979 ◽  
Vol 17 (4) ◽  
pp. 453-459 ◽  
Author(s):  
A. P. Yoganathan ◽  
W. H. Corcoran ◽  
E. C. Harrison ◽  
J. R. Carl
Keyword(s):  
Laser Doppler Anemometer ◽  
Laser Doppler ◽  
Velocity Measurements ◽  
Aortic Prosthesis

Laser Doppler anemometer for in-flight velocity measurements on airplane wings

AIAA Journal ◽  
1999 ◽  
Vol 37 ◽  
pp. 680-687
Author(s):  
S. Becker ◽  
F. Durst ◽  
H. Leinhart
Keyword(s):  
Laser Doppler Anemometer ◽  
Laser Doppler ◽  
Velocity Measurements ◽  
Flight Velocity

Velocity Measurements in Wet Steam Flows by Laser Anemometry and Pitot Tube

1975 ◽  
Vol 97 (1) ◽  
pp. 113-116 ◽  
Author(s):  
R. I. Crane ◽  
A. Melling
Keyword(s):  
Low Pressure ◽  
Laser Doppler Anemometer ◽  
Laser Doppler ◽  
Pitot Tube ◽  
Alternative Methods ◽  
Wet Steam ◽  
Velocity Measurements ◽  
Laser Anemometry ◽  
Pitot Pressure ◽  
Artificial Seeding

Velocities up to 200 m/s in condensing steam flows have been successfully measured using a laser Doppler anemometer, without artificial seeding. The performance of the system is described and results are compared with simultaneous pitot tube measurements. The discrepancy between the alternative methods used here for converting pitot pressure to velocity in subsonic wet flow becomes greater at higher speeds; extension of this work is discussed, with the objective of calibrating pitot tubes for use at high subsonic and low supersonic speeds encountered in low pressure turbines.

Turbulent Stresses in the Region of a Hancock Porcine Bioprosthetic Aortic Valve

1985 ◽  
Vol 107 (3) ◽  
pp. 200-205 ◽  
Author(s):  
F. J. Walburn ◽  
H. N. Sabbah ◽  
P. D. Stein
Keyword(s):  
Shear Stress ◽  
Aortic Valve ◽  
Stroke Volume ◽  
Normal Stress ◽  
Reynolds Shear Stress ◽  
Laser Doppler Anemometer ◽  
Bioprosthetic Valve ◽  
Laser Doppler ◽  
Reynolds Stresses

The purpose of this study was to measure stresses associated with turbulence (Reynolds stresses), in the region of a 29-mm-dia porcine bioprosthetic valve (Hancock, Model 242). Studies were performed in an in vitro pulse duplicating system with the valve mounted in the aortic position. The Reynolds stresses were calculated from velocities obtained with a two channel laser Doppler anemometer. The largest Reynolds shear stress and normal stress occurred at the highest stroke volume used (80 mL). Averaged over ejection they were 38 dynes/cm2 and 380 dynes/cm2, respectively. The maximal instantaneous Reynolds shear stress was 2500 dynes/cm2 and the maximal instantaneous Reynolds normal stress was 6800 dynes/cm2. Stresses of these magnitudes are in the range reported to damage platelets.

Laser Doppler Anemometer for In-Flight Velocity Measurements on Airplane Wings

AIAA Journal ◽  
10.2514/2.795 ◽  
1999 ◽  
Vol 37 (6) ◽  
pp. 680-687 ◽  
Author(s):  
S. Becker ◽  
F. Durst ◽  
H. Lienhart
Keyword(s):  
Laser Doppler Anemometer ◽  
Laser Doppler ◽  
Velocity Measurements ◽  
Flight Velocity

scholarly journals Comparison of velocity measurements by high temperature anemometer and laser-doppler anemometer with results of CFD-simulation

2002 ◽  
Vol 6 (1) ◽  
pp. 3-13 ◽  
Author(s):  
M. Zimmel ◽  
J. Rath ◽  
G. Staudinger ◽  
B. Simpson ◽  
M. Brown ◽  
...  
Keyword(s):  
Cfd Simulation ◽  
Low Cost ◽  
Laser Doppler Anemometer ◽  
Laser Doppler ◽  
Gas Velocity ◽  
Velocity Measurements ◽  
Test Rig ◽  
Blended Coal ◽  
Measurement Results ◽  
Lda Measurement

In the present work, results of gas velocity measurements with a newly developed vane anemometer (HTA - High Tem per a ture Anemometer) are compared with re sults of measurements obtained from Laser-Doppler Anemometer (LDA). The measurements were carried out at the combustion test rig of ALSTOM Combustion Services Ltd. in Derby/UK, and demonstrate the usability and accuracy of the HTA under severe conditions. The test rig was provided with a triple register low NOx coal burner firing pulverised Colombian blended coal at a constant thermal load of 30 MW. Although the environment was both very hot (up to 1350 ?C) and dust laden, the vane anemometer worked with an accuracy comparable to the reference LDA measurement. Since the anemometer represents a relatively simple to use and low cost option compared with LDA, it is seen as aviable alternative for gas velocity measurements in difficult environments. The measurement results are also demonstrated to compare favourably with the results from CFD calculations of the flow in the combustion chamber of the test rig.

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