# Head loss due to contraction

## 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

## 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
Mentor

## 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

## 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
Mentor
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?

#### Attachments

• DSC_0041.JPG
35 KB · Views: 312
Nidum