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Pressure difference

  1. Apr 20, 2016 #1
    1. The problem statement, all variables and given/known data
    is the solution given wrong ? from the bernoulli's equation , (PA-PB) / ρg = hf + ZB - ZA , am i right ? P/s : the Velocity at A and B are the same , so they cancel each other ... but in the solution , the author gave (PA-PB) / ρg = hf + ZA - ZB which is 18.27 +40 , IMO , it should be 18.27-40 , am i right ?

    2. Relevant equations


    3. The attempt at a solution
     

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  2. jcsd
  3. Apr 20, 2016 #2
    Check your algebra.
     
  4. Apr 20, 2016 #3
    ya , what's wrong with it ?
     
  5. Apr 20, 2016 #4
    the question gave point A is 40m higher than B ....
     
  6. Apr 20, 2016 #5
    Yes. I agree with you.
     
  7. Apr 20, 2016 #6
    since 18.27 - 40 has negative value , so the water should flow from B to A ?
     
  8. Apr 20, 2016 #7
    They probably meant to say that B is higher than A.

    By the way, did you check the Reynolds number to see if the flow really would be laminar?
     
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