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Heat Transfer

Heat Transfer
For a multipass shell and tube heat exchanger, the LMTD correction factor is always

< 1
1
Between 1 & 2
> 1

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Heat Transfer
The heat flux in the nucleate boiling regimes is proportional to (where, ΔT = excess temperature)

(ΔT)²
√(ΔT)
(ΔT)³
(ΔT)⁴

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Heat Transfer
Boiling point of a solution according to Duhring's rule is a linear function of the __________ of water.

Viscosity
Thermal conductivity
Boiling point (at the same pressure)
Density

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Heat Transfer
The thermal boundary layer at NPr > 1

Disappears
Is thinner than hydrodynamic boundary layer
Is thicker than hydrodynamic boundary layer
And the hydrodynamic boundary layer are identical

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Heat Transfer
Heat transfer rate per unit area is called

heat flux
thermal conductivity
heat transfer co-efficient
thermal diffusivity

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Heat Transfer
Among liquids, water has a comparatively high value of thermal conductivity, due to its

Low density
Partial ionisation
Dense structure
High viscosity

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