Hot Wire Measurement in Water Tunnels

[chrisych]

Can Hot Wire Measurement run in Water Tunnel?

Thanks a lot!

 

[stewartcs]

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