scholarly journals Flow Rate Measurement of Buoyancy-Driven Exchange Flow by Laser Doppler Velocimeter.

1993 ◽  
Vol 59 (567) ◽  
pp. 3686-3693
Author(s):  
Motoo Fumizawa
Keyword(s):  
Flow Rate ◽  
Laser Doppler ◽  
Laser Doppler Velocimeter ◽  
Exchange Flow ◽  
Rate Measurement ◽  
Flow Rate Measurement

Cryogenic flow rate measurement with a laser Doppler velocimetry standard

2018 ◽  
Vol 29 (3) ◽  
pp. 034009 ◽  
Author(s):  
R Maury ◽  
A Strzelecki ◽  
C Auclercq ◽  
Y Lehot ◽  
S Loubat ◽  
...  
Keyword(s):  
Flow Rate ◽  
Laser Doppler Velocimetry ◽  
Laser Doppler ◽  
Doppler Velocimetry ◽  
Rate Measurement ◽  
Flow Rate Measurement ◽  
Cryogenic Flow

Traceable Flow Rate Measurements With a Very Low Uncertainty Using Laser Doppler Anemometry

2017 ◽  
Author(s):  
Markus Juling ◽  
Jonas Steinbock ◽  
Andreas Weissenbrunner
Keyword(s):  
Flow Rate ◽  
Laser Doppler Anemometry ◽  
Volume Flow Rate ◽  
Primary Standard ◽  
Volume Flow ◽  
Laser Doppler ◽  
Maximum Deviation ◽  
Flow Profile ◽  
Rate Measurement ◽  
Flow Rate Measurement

Precise volume flow rate measurements are very important for various industrial applications. Here, one problem is that the service conditions of a flow meter used in the field differ significantly from the conditions present during calibration. The working conditions such as the pressure, the temperature and the flow profile greatly increase the uncertainty of the flow rate measurement. To address this problem, a new laser-optical flow rate standard (LFS) was developed at the Physikalisch-Technische Bundesanstalt (PTB) that allows flow meters to be calibrated on site, thus greatly reducing the uncertainty of the flow rate measurement. For the LFS, the velocity profile within the pipe is measured with laser Doppler anemometry (LDA). The profile is then integrated to calculate the volume flow rate. Various improvements to LDA have made it possible to measure the flow rate with an uncertainty of less than 0.15 % (k = 2). A comparison of the LFS with the primary standard for thermal energy at PTB, which has an uncertainty of less than 0.04 % (k = 2), revealed a maximum deviation of 0.07 % for Reynolds numbers from 105 to 106, thus verifying the uncertainty of the LFS.

Sign in / Sign up

Export Citation Format

Share Document