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Flow in pipe

  1. May 5, 2016 #1
    1. The problem statement, all variables and given/known data
    in this network of pipe , the author make the attempts to solve it using ( Q1 = Q2 + Q3) , so delta Q = Q1 -(Q2 +Q3) , the value of head of junction that he gt is 25.2 , with delta Q = (3x10^-3) ( not shown in the working)
    2. Relevant equations


    3. The attempt at a solution
    however, when i tried to solve it using ( Q1 + Q2 = Q3) , which means ( Q1 +Q2 - Q3 ) , thae ans that i gt is hj = 28 , with delta Q = 0.07


    P/s : we have to find the delta Q = 0 for the ans so that water from inlet = water from outlet
    so , question has two ans depending on the flow of water ??? or i am wrong ?
     

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  2. jcsd
  3. May 5, 2016 #2
  4. May 5, 2016 #3
    is it wrong to have 2 answer for such question ,
    i find it work by using ( Q1 = Q2 + Q3) and ( Q1 + Q2 = Q3)
     
  5. May 6, 2016 #4
    Anyone can comment ?
     
  6. May 7, 2016 #5
    bump
     
  7. May 7, 2016 #6
    deleted
     
  8. May 7, 2016 #7
    Bump
     
  9. May 7, 2016 #8
    i have done this question in 2 ways , which is ( Q1 - (Q2 + Q3) ) and ( Q1 +Q2 - Q3 ) which is correct ? or both are correct ? please refer to post 1
     
  10. May 22, 2016 #9
    pls ignore the question i posted above ....
    now , i have new question with the same figure..
    from the diagram , we know that the junction is lower than the pipe at B . why the author wanna make an assumption that the junction is located at 20m from the datum ? is it correct to do so ?
     
  11. May 22, 2016 #10
    can i start a new thread and delete this thread ? how to delete this thread ??
     
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