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Heat Transfer Miscellaneous

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Heat Transfer Miscellaneous
  1. In the laminar flow of air (Pr = 0.7) over a heated plate, if δ and δT denote, respectively, the hydrodynamic and thermal boundary layer thicknesses, then
    1. δ = δT
    2. δ > δT
    3. δ < δT
    4. δ = 0 but δT = 0
Correct Option: C

When Pr < 1 ⇒ δT > δ
Pr > 1 ⇒ δT < δ
Pr = 1 ⇒ δT = δ


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