Calculating Vibration in Water Flowing Pipes for Noise Comparison

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Discussion Overview

The discussion centers on calculating vibrations in pipes with water flowing through them, specifically in relation to noise comparison between pipes of different inner diameters. Participants explore various factors influencing vibration and noise generation in this context, including turbulence and external influences.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant inquires about the calculation of vibrations in a pipe with flowing water, expressing uncertainty about the starting point or formulas needed.
  • Another participant suggests that water flowing through a pipe does not typically cause regular oscillation vibrations, questioning whether an external source is involved.
  • A different participant notes that if the inquiry is for research or homework, turbulence in the water flow must be considered, which depends on factors like water speed and pipe design. They mention that smoother pipe surfaces may lead to less turbulence and, consequently, less vibration.
  • One participant asks if the original poster is referring to the phenomenon of water hammer, indicating a specific type of vibration.
  • Another participant introduces the concept of induced vibrations due to vortex shedding from valves and pumps, emphasizing that noise from piping is often related to vibrations.
  • The original poster clarifies their interest in the noise generated by vibrations and specifies a desire to compare oscillation frequencies of two pipes with different inner diameters, rather than calculating the actual noise levels.

Areas of Agreement / Disagreement

Participants express differing views on the significance of vibrations in flowing pipes, with some suggesting that it is not a major concern in practical scenarios, while others highlight specific conditions that could lead to vibrations. The discussion remains unresolved regarding the best approach to calculate or compare the vibrations and noise generated by the pipes.

Contextual Notes

Participants mention various factors affecting turbulence and vibration, but do not reach a consensus on the specific calculations or models to use. The discussion reflects uncertainty about the relevance of certain phenomena, such as water hammer and vortex shedding, in the context of the original inquiry.

RagingSezz
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Hi,

Does anyone know how to calculate the vibration in a pipe with water flowing through it? I have no idea where to start or what formula to use.

Any help would be appreciated. Thanks.
 
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Water flowing through a pipe will not cause it to vibrate with any regular oscillation. Are you referring to a vibration caused by an external source?
 
Unless this is a homework problem I can't picture this being a big problem in reality.

However, if it is for research/homework than you'd have to determine the turbulence in the flow of the water. Which can depend on variables such as, speed of water, design of the pipe, etc. For instance, the smoother the pipe surface from inside on a micro-scale, the less turbulent the flow will be which will cause less vibration.

But as I said, in most practical scenarios, this is never an issue...
 
Are you referring to water hammer??
 
There can be induced vibrations due to vortex shedding, etc... from valving and pumps. Usually the big things I have dealt with are noise due to piping which is of course vibrations.

I think the OP needs to be more precise about what it is they are looking for.
 
There will be turbulent flow of water within the pipe. And I'm interested in the noise generated by the vibrations. To be specific I want to compare the oscillation frequency of two pipes with different inner diameters. So I don't need to find the actual amount of noise, but some way to compare the two pipes with regards to vibration or oscillation frequency.
Thanks for the input so far ^^
 

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