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Pressure difference

  • Thread starter foo9008
  • Start date
  • #1
678
4

Homework Statement


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 ?

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The Attempt at a Solution

 

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Answers and Replies

  • #2
19,919
4,095
Check your algebra.
 
  • #3
678
4
ya , what's wrong with it ?
 
  • #4
678
4
Check your algebra.
the question gave point A is 40m higher than B ....
 
  • #5
19,919
4,095
Yes. I agree with you.
 
  • #6
678
4
Yes. I agree with you.
since 18.27 - 40 has negative value , so the water should flow from B to A ?
 
  • #7
19,919
4,095
since 18.27 - 40 has negative value , so the water should flow from B to A ?
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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