1. Limited time only! Sign up for a free 30min personal 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!

Homework Help: Question asking me to show that the water flow rate is approximately 26kg\s

  1. Dec 5, 2011 #1
    1. A farmer builds a water storage tank 12m above ground.

    The water is fed via a 200m long, 125mm diameter pipe to a field for irrigation purposes. The pipe has a friction factor of 0.008. Using the K data below, show that the water flow rate (kg/s) in the pipe is approximately 26kg/s.
    K factors: Tank exit 0.5, Bend 0.9, valve 1.0 Water density: 1000kg/m3
  2. jcsd
  3. Dec 5, 2011 #2
    So far I understand how to use Bernoulli's equation, and how to use Darcy's equation to obtain the frictional loss of the pipe, but I can't actually do them because I have two unknowns. Those being velocity and frictional head loss.

    I know that to find volume flow rate you multiply the velocity by the cross sectional area of the pipe. Then I guess to find the water flow rate in kg/s I will have to take the flow rate and divide 1000 by it. (1000kg of water per cubic metre.) If someone could point me in the right direction I would be most appreciative.


  4. Dec 6, 2011 #3
    Attempt a trial and error solution until a certain equation balances.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook