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Discussion :: GATE Metallurgical

  1. A steel ball (density ρsteel = 7200 kg/m3) is placed in an upward moving liquid Al (density ρAl = 2360 kg/m3, viscosity μAl = 1 * 10“3 Pa.s and Reynolds number = 5 * 105). The force (F) exerted on the steel ball is expressed as 
    F = f π R2(ρAl v2/2)
    where, f is friction factor (=0.2), v is the velocity of liquid Al and R is the radius of steel ball.
    The terminal velocity of a fine spherical steel particle having diameter dp, in μm range, if allowed to fall in a quiescent liquid Al bath, is
    2. A.
    5.2 * 106 dp2
    B.
    2.6 * 106 dp2
    C.
    1.3 * 106 dp2
    D.
    6.6 * 105 dp2

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    Answer : Option B

    Explanation :

    -NA-

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