Hot Wire Measurement in Water Tunnels

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SUMMARY

Hot Wire Measurement cannot be effectively utilized in water tunnels due to electrolysis issues. The presence of water as a conducting medium leads to electrolysis, which generates bubbles on the wire and results in a continuous reduction in wire diameter. This change in diameter alters the resistance of the wire, ultimately compromising the accuracy of flow velocity measurements.

PREREQUISITES
  • Understanding of electrolysis and its effects on conductive materials
  • Knowledge of flow measurement techniques in fluid dynamics
  • Familiarity with hot wire anemometry principles
  • Basic concepts of resistance and its relation to wire dimensions
NEXT STEPS
  • Research alternative flow measurement techniques suitable for water, such as ultrasonic flow meters
  • Explore the principles of non-conducting mediums in fluid measurement
  • Learn about the effects of electrolysis on different materials in fluid environments
  • Investigate the design and application of hot wire anemometers in non-conductive fluids
USEFUL FOR

Fluid dynamics engineers, researchers in measurement technology, and professionals involved in water flow analysis will benefit from this discussion.

chrisych
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Can Hot Wire Measurement run in Water Tunnel?

Thanks a lot!
 
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chrisych said:
Can Hot Wire Measurement run in Water Tunnel?

Thanks a lot!

No. You need a non-conducting medium. In water, a hot wire will cause electrolysis problems.

The potential drop across the wire is what causes the electrolysis which cause bubbles on the wire. More importantly, there will be a continuous reduction in the wire diameter. Hence the diameter and thus resistance will change. Since the resistance changes, the ability to determine the flow velocity is lost.

CS
 

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