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Discussion :: Heat and Mass Transfer

  1. The thickness of thermal and hydrodynamic boundary layer is equal if Prandtl number is

    2. A.

     Equal to one
    B.

     Greater than one
    C.

     Less than one
    D.

     Equal to Nusselt number

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    Answer : Option A

    Explanation :

    If the Prandtl number (Pr) is 1, the two boundary layers (hydrodynamic and thermal) are the same thickness.
    If the Pr > 1, the thermal boundary layer is thinner than the velocity boundary layer.

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