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!

Pipe temperature calculation

  1. Sep 20, 2012 #1
    is any one help to solve this problem?

    Water at a temperature of 20degree C and a pressure 8 bar enters a pipe of dia.0.2 cm.The Pipe uniformly heated with 5.0kW/m². Calculate the Temperature along the pipe for the pipe length of 20m. plot temperatuer as a function of the pipe length. m=0.5 kg/s

    wasaimal@hotmail.com
     
  2. jcsd
  3. Sep 20, 2012 #2

    Mech_Engineer

    User Avatar
    Science Advisor
    Gold Member

    Re: Pipe temperatuer calculation

    This is obviously homework, what are your thoughts on how it needs to be solved?
     
  4. Sep 20, 2012 #3
    Re: Pipe temperatuer calculation

    I have no clue
     
  5. Sep 23, 2012 #4
    Re: Pipe temperatuer calculation

    Given
    T_in = 20 C^0 Heat Flux = 5.0 kW/m^2
    D = 0.2 cm X = Length = 20 m
    Pressure = 8 bar Area = (πD^2)/4 = (3.14〖(0.002)〗^2)/4 = 3.14E-〖10〗^6 〖 m〗^2
    Calculate
    Calculate the Temperature along the pipe for the pipe length.
    Plot Temperature as a function of the pipe length.
    Energy balanced equation is valid for ant pipe length.
    q’ (X) = m ̇ C_p (T_x - T_in)
    T_x = T_in + (q’)/(mC_p ) ̇ X
    = 20 + 0.0157/(0.5)4180 X = 20 + 7.511E-〖10〗^6 X (It’s a linear distribution along the pipe).

    any one check and if i am on correct path?
     
  6. Oct 25, 2012 #5
    It looks like the problem is overspecified. You can't specify the mass flow rate if you give the pressure drop (presumably 7 bars).

    You first need to get a handle on whether the flow is turbulent or laminar by approximating the Reynolds number. If the flow is laminar, Bird, Stewart, and Lightfoot gives the solution for constant flux laminar flow heating of fluid flow in a tube. If the flow is turbulent, they give the equation for the Nussult Number (dimensionless heat transfer coefficient) as a function of the Reynolds Number and Prantdl number.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Pipe temperature calculation
Loading...