Hot Wire Measurement in Water Tunnels

In summary, hot wire measurement in water tunnels is a technique that uses an electrically heated wire to measure the velocity of water. It works by measuring the change in temperature as the water passes over the wire. This method offers advantages such as non-intrusiveness, accuracy in both laminar and turbulent flows, and cost-effectiveness. However, it also has limitations, including sensitivity to temperature changes and impurities in the water, and may not be suitable for certain types of flows. Hot wire measurement is commonly used in fields such as aerodynamics and fluid mechanics to study water flow behavior and measure the performance of hydraulic systems.
  • #1
chrisych
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Can Hot Wire Measurement run in Water Tunnel?

Thanks a lot!
 
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  • #2
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
 

Related to Hot Wire Measurement in Water Tunnels

1. What is hot wire measurement in water tunnels?

Hot wire measurement in water tunnels is a technique used to measure the velocity of water in a controlled environment. It involves passing an electrically heated wire through the water flow and measuring the change in temperature as an indication of the water velocity.

2. How does hot wire measurement work?

Hot wire measurement works by heating a thin wire, typically made of platinum, to a high temperature and placing it in the water flow. As the water passes over the wire, the heat is transferred to the water, causing a change in temperature. This change is then measured and converted into a velocity reading.

3. What are the advantages of hot wire measurement in water tunnels?

Hot wire measurement in water tunnels offers several advantages over other measurement techniques. It is non-intrusive, meaning it does not disrupt the flow of water, and it can provide accurate and precise measurements in both laminar and turbulent flows. It is also a relatively simple and cost-effective method compared to other techniques.

4. What are the limitations of hot wire measurement in water tunnels?

Although hot wire measurement has many advantages, it also has some limitations. It is highly sensitive to changes in water temperature and can be affected by impurities in the water. It also requires careful calibration and may not be suitable for some types of water flow, such as low velocities or highly turbulent flows.

5. What are some applications of hot wire measurement in water tunnels?

Hot wire measurement in water tunnels is commonly used in various fields, including aerodynamics, hydrodynamics, and fluid mechanics. It is often used to study the behavior of water flow around objects, such as ships, submarines, and aircraft, and to test the efficiency of different designs. It can also be used to measure the performance of pumps, turbines, and other hydraulic systems.

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