How does pipe thickness affect head loss at entrance?

In summary, the degree of contraction in loss of head at entrance is influenced by the thickness of the pipe walls and the diameter of the pipe compared to its flow. The author also notes that the loss coefficient, represented by k, will vary for very thin tubes, resulting in a higher value for head loss. The equation for head loss is given as k(V^2)/2g, where V is the velocity of water. A diagram may help clarify this concept further.
  • #1
foo9008
678
4

Homework Statement


I was told that for loss of head at entrance , the degree of contaction depends on how thick the pipe walls is .
i really don't know the meaning , can someone clarify ? the author also stated that the loss coefficients will vary , for very thin tubes , k is very high ?
head loss = k (V^2) / 2g

Homework Equations

The Attempt at a Solution


as we can see , the haed loss is affected by velocity of water , how can thickness of pipe affect the head loss? [/B]
 
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  • #2
foo9008 said:

Homework Statement


I was told that for loss of head at entrance , the degree of contaction depends on how thick the pipe walls is .
i really don't know the meaning , can someone clarify ? the author also stated that the loss coefficients will vary , for very thin tubes , k is very high ?
head loss = k (V^2) / 2g

Homework Equations

The Attempt at a Solution


as we can see , the haed loss is affected by velocity of water , how can thickness of pipe affect the head loss? [/B]
Can you provide an exact quote?
 
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  • #3
Chestermiller said:
Can you provide an exact quote?
The degree of contraction depends upon how far the flow the pipe may project within the reservior and also how thick the pipe walls are , compared with its diameter
 
  • #4
foo9008 said:
The degree of contraction depends upon how far the flow the pipe may project within the reservior and also how thick the pipe walls are , compared with its diameter
Can you provide a diagram?
 
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  • #5
Chestermiller said:
Can you provide a diagram?
 

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  • #6
Edit : Inlet profiles illustration removed .
 
Last edited:
  • #7
Nidum said:
https://www.physicsforums.com/attachments/100868
What are you trying to say?
 
  • #8
Chestermiller said:
Can you provide a diagram?
do you have any idea now ?
 

Related to How does pipe thickness affect head loss at entrance?

What is head loss due to contraction?

Head loss due to contraction is a phenomenon in fluid mechanics where the pressure of a fluid decreases as it passes through a constricted section of a pipe or channel. This results in a decrease in the fluid's energy, or head, which can have various implications for the flow rate and efficiency of a system.

What causes head loss due to contraction?

The main cause of head loss due to contraction is the sudden change in cross-sectional area of a pipe or channel. This change disrupts the smooth flow of the fluid and creates turbulence, which leads to a decrease in pressure and energy.

How is head loss due to contraction calculated?

The most commonly used equation for calculating head loss due to contraction is the Bernoulli's equation, which takes into account the change in fluid velocity, density, and pressure between the upstream and downstream sections of the contraction. Other methods, such as the energy equation or empirical formulas, can also be used.

How does head loss due to contraction affect flow rate?

Head loss due to contraction can significantly reduce the flow rate of a fluid. This is because the decrease in pressure and energy results in a decrease in the fluid's velocity, which in turn affects the overall flow rate of the system. Therefore, it is important to consider head loss due to contraction when designing or analyzing fluid systems.

How can head loss due to contraction be minimized?

There are several ways to minimize head loss due to contraction, including using gradual transitions between pipe or channel sections, minimizing the change in cross-sectional area, and using smoother surfaces inside the pipe or channel. Additionally, careful design and proper maintenance of the system can also help reduce head loss due to contraction.

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