Is Transient Flow Caused by Changes in Velocity's Direction in Pipelines?

In summary, the conversation discusses the concept of transient in fluid flow in pipelines. It is noted that velocity, which is a vector parameter, can change due to both changes in quantity and direction. The discussion also mentions that transient is often associated with changes in velocity's quantity rather than direction. The speaker then questions whether a bend in a pipe, which changes the flow direction, would result in a transient. The expert summarizer notes that a bend can alter the flow direction and exert a force on the fluid, but this does not necessarily make it a transient flow. The key factor in determining a transient flow is whether the flow field changes with time.
  • #1
Mikealvarado100
55
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Hi every one;

Transient [Fluid Transient in Pipelines] is result of changing in momentum and momentum is result of changing in velocity. Velocity is a vector parameter. It means that Velocity's change is due to changing in velocity's quantity or velocity's direction. All discussions about transient Analysis (in books and references) speaks about Transient as result of changing in AMOUNT of velocity not changing in DIRECTION of it.
Assume a pipe with no operations or branches, valves or ... but there is a Bend along the pipe. Changing in velocity's direction makes momentum and therefore it must makes a transient. Am I right or I make mistake and Transient is due to JUST velocity's quantity?

Thanx in advance.
 
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  • #2
I am not sure why you are using the word transient to describe flow in a bend. One could have steady flow in a bend. Yes, a bend will alter the flow direction and must therefore exert a force on the fluid. This doesn't make it a transient flow, however. If the flow field does not change with time, then it is a steady flow regardless of the shape of the pipe.
 
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Q: What is a fluid transient in pipelines?

A fluid transient in pipelines is a sudden change in pressure and flow rate of the fluid within a pipeline. This can be caused by various factors such as pump or valve operations, changes in fluid properties, or sudden changes in demand.

Q: How does a fluid transient affect pipeline systems?

A fluid transient can have both short-term and long-term effects on pipeline systems. In the short-term, it can cause pressure spikes that can damage the pipeline and lead to leaks or bursts. In the long-term, it can cause fatigue and wear on the pipeline, reducing its lifespan.

Q: How do scientists study and analyze fluid transients in pipelines?

Scientists use various mathematical models and simulations to study and analyze fluid transients in pipelines. These models take into account the properties of the fluid, the characteristics of the pipeline, and the operating conditions to predict the behavior of the fluid during a transient event.

Q: What are some methods for controlling fluid transients in pipelines?

There are several methods for controlling fluid transients in pipelines, including the use of surge tanks, pressure relief valves, and surge suppressors. These devices can help absorb and dissipate the energy from the transient, reducing its impact on the pipeline system.

Q: How can fluid transients be prevented in pipelines?

Fluid transients can be prevented by carefully designing and operating the pipeline system. This includes properly sizing and locating pumps and valves, using appropriate materials for the pipeline, and implementing surge protection devices. Regular maintenance and monitoring of the pipeline system can also help prevent fluid transients.

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