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Lv 7
? asked in Science & MathematicsPhysics · 7 years ago

Steam enters a circular pipe at 1600 kPa ....?

Steam enters a circular pipe at 1600 kPa, 400 oC and 10 m/sec and exits at 1000 kPa and 32 m/sec. The diameter of the pipe at the entrance is 15 cm. find parameters of steam and pipe. ( correct solution needed very urgent.)

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  • Physics BOSS
    Lv 4
    7 years ago

    The volume entering the pipe and exiting the pipe must be the same.

    So in one second,

    V1(entering pipe) = Pi X (15/200)^2 X 10 and

    V2(leaving pipe) = Pi X (D/2)^2 X 32

    Equating, V1 = V2

    After cancelling Pi on both sides of equation,

    so 0.05625 = 8D^2

    working, D = 0.08385m = 8.39 cm.

    Using P1/T1 = P2/T2

    where P1 = 1600kPa, T1 = 673K and P2 = 1000kPa

    then 1600 / 673 = 1000 / T2

    so T2 = 420.625K

    which is 147.625 degree C = 148 degree C.

    Hope it helps.

  • ?
    Lv 5
    7 years ago

    use eqn of continuity

    A1v1=A2v2

    get A2

    then bernoulli's principle

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