Acoustic Resonance in large water filled pipes

In summary: Overall, both the assumption of the large pipe being open and the flow of water through the small pipe can affect the calculated resonant frequencies. In summary, the conversation discusses the calculation of resonance frequencies in a system consisting of a 1.5m diameter and 7m long pipe blocked at one end, leading into a 2.8m diameter horizontally laid manifold. The pipes are filled with water. The assumption of the large pipe being an open end will significantly affect the calculated resonant frequencies, as the pressure wave reflections will be different. The flow of water through the small pipe may also have an impact on the frequencies, depending on the size of the opening.
  • #1
bartock
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say i have a 1.5m diameter and 7m lond pipe, blocked of at one end and leading into a 2.8m diameter horizontaly laid manifold (so that effectively you have one small pipe branching of another large pipe), the pipes are filled with water. In order to calculate the resonance frequencies, i would assume the large pipe is effectievly an open end.

How much would that assumption effect the values of the resonant frequencies calculate?

Also, if the water was flowing through the closed end of the small pipe(through a insignificatly small hole in the valve) at say no more than 4m/s, would this velocity effect the frequencies?
 
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  • #2
The assumption of the large pipe being an open end would affect the calculated resonant frequencies significantly. Since the end is closed off and not open, the pressure wave reflections from the end of the pipe will be different than if it were open, resulting in a different frequency resonance. The flow of water through the small pipe may also affect the resonant frequencies, depending on the size of the hole or opening. If the opening is large enough, it could result in a similar effect as if the large pipe were open. If the opening is not large enough, then the effect will be minimal.
 
  • #3


Acoustic resonance in large water-filled pipes is a well-studied phenomenon and has many practical applications, such as in musical instruments and industrial processes. In this scenario, the assumption that the large pipe is effectively an open end is a reasonable one, as the diameter of the pipe is significantly larger than the wavelength of the sound waves produced. This assumption would not significantly affect the values of the resonant frequencies calculated.

The velocity of the water flowing through the closed end of the small pipe would also have a minimal effect on the resonant frequencies. This is because the velocity of the water is much lower than the speed of sound in water, which is approximately 1500 m/s. Therefore, the velocity of 4m/s would not significantly change the properties of the sound waves within the pipe.

However, it is important to note that the velocity of the water could affect the amplitude and phase of the sound waves, which could potentially alter the overall sound produced. This could be important in certain applications, such as in musical instruments where precise control over the sound is desired.

In conclusion, the assumptions made in this scenario are reasonable and would not significantly affect the values of the resonant frequencies calculated. However, the velocity of the water could have an impact on the properties of the sound waves and should be taken into consideration in certain applications.
 

1. What is acoustic resonance in large water filled pipes?

Acoustic resonance in large water filled pipes is a phenomenon in which sound waves at a specific frequency cause the pipe to vibrate and produce a loud, sustained noise. This occurs when the natural frequency of the pipe matches the frequency of the sound waves.

2. How does acoustic resonance in large water filled pipes occur?

Acoustic resonance in large water filled pipes occurs when sound waves enter the pipe and cause the water inside to vibrate at a specific frequency. This vibration then causes the pipe to vibrate, amplifying the sound and creating a loud noise.

3. What causes acoustic resonance in large water filled pipes?

There are several factors that can cause acoustic resonance in large water filled pipes, including the dimensions of the pipe, the material it is made of, and the speed of sound in water. Any of these factors can affect the natural frequency of the pipe and make it susceptible to resonance.

4. Is acoustic resonance in large water filled pipes harmful?

Acoustic resonance in large water filled pipes can be harmful if it occurs at high enough levels. The loud noise produced can cause damage to the ears and can also lead to structural damage to the pipe itself if it persists for a long period of time.

5. How can acoustic resonance in large water filled pipes be prevented?

To prevent acoustic resonance in large water filled pipes, it is important to carefully design and select the materials for the pipe to ensure that its natural frequency does not match common sound frequencies. Additionally, regular maintenance and inspection of the pipes can help identify and address any potential resonance issues before they become a problem.

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