Excess thermodynamic function for ternary systems. 4. Total-pressure data and GE for acetonitrile-ethanol-water at 50.degree.C

1979 ◽  
Vol 24 (2) ◽  
pp. 130-132 ◽  
Author(s):  
Stephen R. Wilson ◽  
Rohit B. Patel ◽  
Michael M. Abbott ◽  
Hendrick C. Van Ness
Keyword(s):  
Thermodynamic Function ◽  
Total Pressure ◽  
Ternary Systems ◽  
Pressure Data ◽  
Excess Thermodynamic Function

Total Pressure Correction of a Sub-Miniature Five-Hole Probe in Areas of Pressure Gradients

2012 ◽  
Author(s):  
J. Town ◽  
A. Akturk ◽  
C. Camcı
Keyword(s):  
Pressure Measurement ◽  
Measurement Errors ◽  
Total Pressure ◽  
Pressure Gradients ◽  
Pressure Data ◽  
Flow Conditions ◽  
Complex Flow ◽  
Ducted Fan ◽  
The Difference ◽  
Best Fit

Five-hole probes, being a dependable and accurate aerodynamic tools, are excellent choices for measuring complex flow fields. However, total pressure gradients can induce measurement errors. The combined effect of the different flow conditions on the ports causes the measured total pressure to be prone to a greater error. This paper proposes a way to correct the total pressure measurement. The correction is based on the difference between the measured total pressure data of a Kiel probe and a sub-miniature prism-type five-hole probe. By comparing them in a ducted fan related flow field, a line of best fit was constructed. The line of best fit is dependent on the slope of the line in a total pressure versus span and difference in total pressure between the probes at the same location. A computer program, performs the comparison and creates the correction equation. The equation is subsequently applied to the five-hole probe total pressure measurement, and the other dependent values are adjusted. The validity of the correction is then tested by placing the Kiel probe and the five-hole probe in ducted fans with a variety of different tip clearances.

scholarly journals Measurements of Water Pressure in Moulins as Part of a Movement Study of the White Glacier, Axel Heiberg Island, Northwest Territories, Canada

1972 ◽  
Vol 11 (61) ◽  
pp. 53-58 ◽  
Author(s):  
Almut Iken
Keyword(s):  
Northwest Territories ◽  
Atmospheric Pressure ◽  
Total Pressure ◽  
Water Pressure ◽  
Surface Velocity ◽  
Pressure Data ◽  
Measuring Range ◽  
Surface Measurements ◽  
Movement Study ◽  
Different Depths

AbstractIn 1970 water pressure was measured in several moulins on the White Glacier. Pressure variations in some moulin channels extended over the full measuring range of the instruments (0–1 and 0–2 bar above atmospheric pressure), even at depths of less than 50 m below the surface. Measurements at different depths showed that total pressure variations were sometimes greater than this. The pressure data are compared with variations in the surface velocity of the glacier.

Sign in / Sign up

Export Citation Format

Share Document