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Heat Transfer
Convection
GATE 2016
Medium

Steam at 100°C condenses (laminar film) on a vertical plate. Nu1, Nu2 are average Nusselt numbers at plate temperatures 10°C and 55°C respectively. Using Nusselt film-condensation theory, Nu2/Nu1 is

  • A0.5
  • B0.84
  • 1.19
  • D1.41

Explanation

Nu∝ΔT^(−1/4). ΔT1=100−10=90, ΔT2=100−55=45. Nu2/Nu1=(ΔT1/ΔT2)^0.25=2^0.25=1.19.

Source: GATE CH 2016 (2016)

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