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Homework Help: A 10m long, sloping pipe has an entrance of 100mm

  1. Dec 28, 2012 #1
    1. The problem statement, all variables and given/known data

    "A 10m long, sloping pipe has an entrance of 100mm diameter water velocity at the pipe entrance is 4m/s and a gauge pressure is 35,000n/m^2. the pipe abruptly expands to 200mm diameter halfway along its length and the exit point is 0.5 below the entrance. The head loss due to friction has been calculated using the d'arcy's formula to be 0.3m - Using bernoulli's equation calculate the gauge pressure in the pipe at the exit".

    2. Relevant equations
    Z1 + Vi^2/zg + P1/zg = Z2 + V2^2/zg + P2/rho g + HL

    3. The attempt at a solution

    More looking for confirmation of the correct formula I should be using?

  2. jcsd
  3. Dec 28, 2012 #2

    rude man

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    Homework Helper
    Gold Member

    Re: Bernoulli's

    It would help if you used conventional symbols, or at least define the ones you are using.

    Z = height,
    z = density (why call it "z" here and "rho" on the right-hand side?)
    by "Vi" you meant to say "V1"

    then your kinetic energy terms are still wrong. But at least the head loss term is correctly placed.

    The usual symbols are ρ for density and h for height.
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