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Homework Help: Head loss due to contraction

  1. May 17, 2016 #1
    1. The problem statement, all variables and given/known data
    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

    2. Relevant equations

    3. 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?
  2. jcsd
  3. May 17, 2016 #2
    Can you provide an exact quote?
  4. May 17, 2016 #3
    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
  5. May 17, 2016 #4
    Can you provide a diagram?
  6. May 17, 2016 #5

    Attached Files:

  7. May 17, 2016 #6


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    Edit : Inlet profiles illustration removed .
    Last edited: May 17, 2016
  8. May 17, 2016 #7
  9. May 17, 2016 #8
    do you have any idea now ?
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