Hot Wire Measurement in Water Tunnels

AI Thread Summary
Hot wire measurement cannot be effectively used in water tunnels due to the conductive nature of water, which leads to electrolysis issues. This electrolysis generates bubbles on the wire, resulting in a continuous reduction in wire diameter. As the diameter decreases, the resistance of the wire changes, compromising the accuracy of flow velocity measurements. Therefore, alternative non-conducting mediums are necessary for reliable hot wire measurements. Using hot wire in water tunnels is not feasible for accurate flow analysis.
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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