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Pipe temperature calculation

  1. Sep 20, 2012 #1

    wasaimal

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    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
     
    wasaimal, Sep 20, 2012
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  3. Sep 20, 2012 #2

    Mech_Engineer

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    Re: Pipe temperatuer calculation

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

    wasaimal

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    Re: Pipe temperatuer calculation

    I have no clue
     
    wasaimal, Sep 20, 2012
  5. Sep 23, 2012 #4

    wasaimal

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    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?
     
    wasaimal, Sep 23, 2012
  6. Oct 25, 2012 #5

    Chestermiller

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    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.
     
    Chestermiller, Oct 25, 2012
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