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Unformatted text preview: n a moving
stream. | Static pressure
0 –10% | 0° 10°
Yaw angle θ e-Text Main Menu | 20° Textbook Table of Contents Differential
transducer | Study Guide 6.10 Fluid Meters 389 blood flow in arteries and veins. It is not suitable for low-velocity measurement in
gases because of the small pressure differences developed. For example, if V 1 ft/s
in standard air, from Eq. (6.117) we compute p0 p equal to only 0.001 lbf/ft2 (0.048
Pa). This is beyond the resolution of most pressure gages. Electromagnetic meter. If a magnetic field is applied across a conducting fluid, the
fluid motion will induce a voltage across two electrodes placed in or near the flow. The
electrodes can be streamlined or built into the wall, and they cause little or no flow resistance. The output is very strong for highly conducting fluids such as liquid metals.
Seawater also gives good output, and electromagnetic current meters are in common
use in oceanography. Even low-conductivity fresh water can be measured by amplifying the output and insulating the electrodes. Commercial in...
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This note was uploaded on 10/27/2009 for the course MAE 101a taught by Professor Sakar during the Spring '08 term at UCSD.
- Spring '08