1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Flow in branch pipe

  1. May 4, 2016 #1
    1. The problem statement, all variables and given/known data
    in the notes , the author stated that the water from reservoir 1 could flow to reservoir 2 and 3 ..... i dont understand how could the water flow from 1 to 2 through junction D ? how could the water flow from low to high ? OrulDXM.png

    2. Relevant equations


    3. The attempt at a solution
     
  2. jcsd
  3. May 4, 2016 #2

    BvU

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    Now my response went into the black hole :cry:

    Don't see no D !

    And water flows under the driving force we call pressure ! As long as pa > pb it will flow, up or down or sideways from a to b - as long as there is a path!
     
    Last edited: May 4, 2016
  4. May 4, 2016 #3
    do you mean as long as position reservoir A > B , the pressure is large enough for the water to flow upwards?
     
  5. May 4, 2016 #4

    BvU

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    It's a bit more complicated than that because of the presence of reservoir 3.
    It's not the position that 'decides', but the pressure.
    From the picture I'd conclude that ##H_J > h_{f2}## is the condition for flow towards the second reservoir. For instance if pipe 3 is very narrow.
     
  6. May 4, 2016 #5
    ##H_J ? what do you mean by it ?
     
  7. May 4, 2016 #6
    how to know that if P at A > P at B ?
     
  8. May 4, 2016 #7

    BvU

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    That's exactly what they try to teach you with the picture !
    ##H_J## is the total head at J (what you called D, the branching point). Since that depends on the flows and the flows depend on the head differences, they propose an iterative solution method.
     
  9. May 4, 2016 #8
    ok , can i also say it as position of A is the highest , so P/( rho g ) + z has the highest value for A ?
     
  10. May 4, 2016 #9
    i dont understand how could the water flow from q to 3 and Q2 is 0 ?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Flow in branch pipe
  1. Pipe Flow (Replies: 2)

  2. Flow in branching pipe (Replies: 7)

  3. Flow in branch pipe (Replies: 21)

  4. Laminar flow in pipe (Replies: 3)

  5. Flow in branch pipe 2 (Replies: 15)

Loading...