Head loss due to contraction

[foo9008]

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]

 

[Chestermiller]

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?

 

[foo9008]

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

 

[Chestermiller]

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?

 

[foo9008]

Can you provide a diagram?

 

[Nidum]

Edit : Inlet profiles illustration removed .

 

[foo9008]

https://www.physicsforums.com/attachments/100868

What are you trying to say?

 

[foo9008]

Can you provide a diagram?

do you have any idea now ?