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Discussion :: Heat and Mass Transfer

  1. A cube at high temperature is immersed in a constant temperature bath. It loses heat from its top, bottom and side surfaces with heat transfer coefficients of h₁, h₂ and h₃ respectively. The average heat transfer coefficient for the cube is

  2. A.

     h₁ + h₂ + h₃

    B.

     (h₁.h₂.h₃)1/3

    C.

     1/h₁ + 1/h₂ + 1/h₃

    D.

     None of these

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    Answer : Option C

    Explanation :

    A cube at high temperature is immersed in a constant temperature bath. It loses heat from its top, bottom and side surfaces with heat transfer coefficients of h₁, h₂ and h₃ respectively. The average heat transfer coefficient for the cube is 1/h₁ + 1/h₂ + 1/h₃


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