Heat Transfer

Q1:

Calburn analogy is applicable for the value of Prandtl number from

A 0.001 to 1

B 0.6 to 120

C 0.5 to 5

D 120 to 400

ANS:B - 0.6 to 120

The Calburn analogy relates the heat transfer coefficient to the mass transfer coefficient in a system. It is often applied in cases where both heat transfer and mass transfer occur simultaneously, such as in evaporative cooling or condensation processes. The Prandtl number (๐‘ƒ๐‘ŸPr) is a dimensionless number that represents the ratio of momentum diffusivity to thermal diffusivity. It is defined as: ๐‘ƒ๐‘Ÿ=Momentum diffusivityThermal diffusivity=๐œ‡⋅๐‘๐‘๐‘˜Pr=Thermal diffusivityMomentum diffusivityโ€‹=kμ⋅cpโ€‹โ€‹ where:

  • ๐œ‡μ is the dynamic viscosity,
  • ๐‘๐‘cpโ€‹ is the specific heat at constant pressure,
  • ๐‘˜k is the thermal conductivity.
The range of Prandtl numbers over which the Calburn analogy is typically applicable depends on the specific conditions of the system. However, generally, it is most commonly applied in the range of 0.6 to 120. So, the correct range for the applicability of the Calburn analogy is: 0.6 to 1200.6to120



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